Method and apparatus for performing wireless communication related to SL DRX in NR V2X

ABSTRACT

Proposed are a method by which a first device performs wireless communication, and an apparatus supporting same. For example, the first device may obtain a sidelink discontinuous reception configuration including information related to an SL DRX timer. For example, the first device may obtain information related to a scheduling request configuration for a SL channel state information reporting medium access control control element (CE). For example, the first device may determine the SR configuration for the SL CSI reporting MAC CE as an SR configuration for an SL DRX command MAC CE. For example, the first device may transmit, to the base station, an SR for requesting a resource for the SL DRX command MAC CE, based on the SR configuration for the SL CSI reporting MAC CE. For example, the first device may transmit, to the second device, the SL DRX command MAC CE, based on the resource.

CROSS-REFERENCE TO RELATED APPLICATIONS

Pursuant to 35 U.S.C. § 119, this application claims the benefit ofearlier filing date and right of priority to Korean Application No.10-2021-0157934, filed on Nov. 16, 2021, and also claims the benefit ofU.S. Provisional Application No. 63/286,070, filed on Dec. 5, 2021, thecontents of which are all hereby incorporated by reference herein intheir entirety.

FIELD

This disclosure relates to a wireless communication system.

BACKGROUND

Sidelink (SL) communication is a communication scheme in which a directlink is established between User Equipments (UEs) and the UEs exchangevoice and data directly with each other without intervention of anevolved Node B (eNB). SL communication is under consideration as asolution to the overhead of an eNB caused by rapidly increasing datatraffic. Vehicle-to-everything (V2X) refers to a communicationtechnology through which a vehicle exchanges information with anothervehicle, a pedestrian, an object having an infrastructure (or infra)established therein, and so on. The V2X may be divided into 4 types,such as vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I),vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). The V2Xcommunication may be provided via a PC5 interface and/or Uu interface.

Meanwhile, as a wider range of communication devices require largercommunication capacities, the need for mobile broadband communicationthat is more enhanced than the existing Radio Access Technology (RAT) isrising. Accordingly, discussions are made on services and user equipment(UE) that are sensitive to reliability and latency. And, a nextgeneration radio access technology that is based on the enhanced mobilebroadband communication, massive Machine Type Communication (MTC),Ultra-Reliable and Low Latency Communication (URLLC), and so on, may bereferred to as a new radio access technology (RAT) or new radio (NR).Herein, the NR may also support vehicle-to-everything (V2X)communication.

SUMMARY OF THE DISCLOSURE Technical Solutions

According to an embodiment of the present disclosure, a method forperforming wireless communication by a first device may be proposed. Forexample, the first device may obtain a sidelink (SL) discontinuousreception (DRX) configuration including information related to an SL DRXtimer. For example, the SL DRX timer may include at least one of an SLDRX onduration timer or an SL DRX inactivity timer. For example, thefirst device may obtain information related to a scheduling request (SR)configuration for a SL channel state information (CSI) reporting mediumaccess control (MAC) control element (CE). For example, the first devicemay determine the SR configuration for the SL CSI reporting MAC CE as anSR configuration for an SL DRX command MAC CE. For example, the firstdevice may transmit, to the base station, an SR for requesting aresource for the SL DRX command MAC CE, based on the SR configurationfor the SL CSI reporting MAC CE. For example, the first device maytransmit, to the second device, the SL DRX command MAC CE, based on theresource. For example, the SL DRX command MAC CE may be information forstopping at least one of the SL DRX onduration timer or the SL DRXinactivity timer.

According to an embodiment of the present disclosure, a first device forperforming wireless communication may be proposed. For example, thefirst device may include one or more memories storing instructions; oneor more transceivers; and one or more processors operably connected tothe one or more memories and the one or more transceivers, and the oneor more processors may execute the instructions to: obtain a sidelink(SL) discontinuous reception (DRX) configuration including informationrelated to an SL DRX timer. For example, the SL DRX timer may include atleast one of an SL DRX onduration timer or an SL DRX inactivity timer.For example, the one or more processors may execute the instructions to:obtain information related to a scheduling request (SR) configurationfor a SL channel state information (CSI) reporting medium access control(MAC) control element (CE). For example, the one or more processors mayexecute the instructions to: determine the SR configuration for the SLCSI reporting MAC CE as an SR configuration for an SL DRX command MACCE. For example, the one or more processors may execute the instructionsto: transmit, to the base station, an SR for requesting a resource forthe SL DRX command MAC CE, based on the SR configuration for the SL CSIreporting MAC CE. For example, the one or more processors may executethe instructions to: transmit, to the second device, the SL DRX commandMAC CE, based on the resource. For example, the SL DRX command MAC CEmay be information for stopping at least one of the SL DRX ondurationtimer or the SL DRX inactivity timer.

According to an embodiment of the present disclosure, an deviceconfigured to control a first UE may be proposed. For example, thedevice may comprise: one or more processors; and one or more memoriesoperably connected to the one or more processors and storinginstructions, and the one or more processors may execute theinstructions to: obtain a sidelink (SL) discontinuous reception (DRX)configuration including information related to an SL DRX timer. Forexample, the SL DRX timer may include at least one of an SL DRXonduration timer or an SL DRX inactivity timer. For example, the one ormore processors may execute the instructions to: obtain informationrelated to a scheduling request (SR) configuration for a SL channelstate information (CSI) reporting medium access control (MAC) controlelement (CE). For example, the one or more processors may execute theinstructions to: determine the SR configuration for the SL CSI reportingMAC CE as an SR configuration for an SL DRX command MAC CE. For example,the one or more processors may execute the instructions to: transmit, tothe base station, an SR for requesting a resource for the SL DRX commandMAC CE, based on the SR configuration for the SL CSI reporting MAC CE.For example, the one or more processors may execute the instructions to:transmit, to the second UE, the SL DRX command MAC CE, based on theresource. For example, the SL DRX command MAC CE may be information forstopping at least one of the SL DRX onduration timer or the SL DRXinactivity timer.

According to an embodiment of the present disclosure, non-transitorycomputer-readable storage medium storing instructions may be proposed.For example, the instructions, when executed, may cause a first deviceto: obtain a sidelink (SL) discontinuous reception (DRX) configurationincluding information related to an SL DRX timer. For example, the SLDRX timer may include at least one of an SL DRX onduration timer or anSL DRX inactivity timer. For example, the instructions, when executed,may cause a first device to: obtain information related to a schedulingrequest (SR) configuration for a SL channel state information (CSI)reporting medium access control (MAC) control element (CE). For example,the instructions, when executed, may cause a first device to: determinethe SR configuration for the SL CSI reporting MAC CE as an SRconfiguration for an SL DRX command MAC CE. For example, theinstructions, when executed, may cause a first device to: transmit, tothe base station, an SR for requesting a resource for the SL DRX commandMAC CE, based on the SR configuration for the SL CSI reporting MAC CE.For example, the instructions, when executed, may cause a first deviceto: transmit, to the second device, the SL DRX command MAC CE, based onthe resource. For example, the SL DRX command MAC CE may be informationfor stopping at least one of the SL DRX onduration timer or the SL DRXinactivity timer.

According to an embodiment of the present disclosure, a method forperforming wireless communication by a base station may be proposed. Forexample, the base station may obtain a sidelink (SL) discontinuousreception (DRX) configuration including information related to an SL DRXtimer. For example, the SL DRX timer may include at least one of an SLDRX onduration timer or an SL DRX inactivity timer. For example, thebase station may obtain information related to a scheduling request (SR)configuration for a SL channel state information (CSI) reporting mediumaccess control (MAC) control element (CE). For example, the SRconfiguration may be determined for the SL CSI reporting MAC CE as an SRconfiguration for an SL DRX command MAC CE. For example, the basestation may receive, from the first device, an SR for requesting aresource for the SL DRX command MAC CE, based on the SR configurationfor the SL CSI reporting MAC CE. For example, the SL DRX command MAC CEmay be transmitted, to the second device, based on the resource. Forexample, the SL DRX command MAC CE may be information for stopping atleast one of the SL DRX onduration timer or the SL DRX inactivity timer.

According to an embodiment of the present disclosure, a base station forperforming wireless communication may be proposed. For example, the basestation may include one or more memories storing instructions; one ormore transceivers; and one or more processors operably connected to theone or more memories and the one or more transceivers, and the one ormore processors may execute the instructions to: obtain a sidelink (SL)discontinuous reception (DRX) configuration including informationrelated to an SL DRX timer. For example, the SL DRX timer may include atleast one of an SL DRX onduration timer or an SL DRX inactivity timer.For example, the one or more processors may execute the instructions to:obtain information related to a scheduling request (SR) configurationfor a SL channel state information (CSI) reporting medium access control(MAC) control element (CE). For example, the SR configuration may bedetermined for the SL CSI reporting MAC CE as an SR configuration for anSL DRX command MAC CE. For example, the one or more processors mayexecute the instructions to: receive, from a first device, an SR forrequesting a resource for the SL DRX command MAC CE, based on the SRconfiguration for the SL CSI reporting MAC CE. For example, the SL DRXcommand MAC CE may be transmitted, to a second device, based on theresource. For example, the SL DRX command MAC CE may be information forstopping at least one of the SL DRX onduration timer or the SL DRXinactivity timer.

According to an embodiment of the present disclosure, an apparatusconfigured to control a base station may be proposed. For example, theapparatus may comprise: one or more processors; and one or more memoriesoperably connected to the one or more processors and storinginstructions, and the one or more processors may execute theinstructions to: obtain a sidelink (SL) discontinuous reception (DRX)configuration including information related to an SL DRX timer. Forexample, the SL DRX timer may include at least one of an SL DRXonduration timer or an SL DRX inactivity timer. For example, the one ormore processors may execute the instructions to: obtain informationrelated to a scheduling request (SR) configuration for a SL channelstate information (CSI) reporting medium access control (MAC) controlelement (CE). For example, the SR configuration may be determined forthe SL CSI reporting MAC CE as an SR configuration for an SL DRX commandMAC CE. For example, the one or more processors may execute theinstructions to: receive, from a first UE, an SR for requesting aresource for the SL DRX command MAC CE, based on the SR configurationfor the SL CSI reporting MAC CE. For example, the SL DRX command MAC CEmay be transmitted, to the second UE, based on the resource. Forexample, the SL DRX command MAC CE may be information for stopping atleast one of the SL DRX onduration timer or the SL DRX inactivity timer.

According to an embodiment of the present disclosure, non-transitorycomputer-readable storage medium storing instructions may be proposed.For example, the instructions, when executed, may cause a second deviceto: obtain a sidelink (SL) discontinuous reception (DRX) configurationincluding information related to an SL DRX timer. For example, the SLDRX timer may include at least one of an SL DRX onduration timer or anSL DRX inactivity timer. For example, the instructions, when executed,may cause a second device to: obtain information related to a schedulingrequest (SR) configuration for a SL channel state information (CSI)reporting medium access control (MAC) control element (CE). For example,the SR configuration may be determined for the SL CSI reporting MAC CEas an SR configuration for an SL DRX command MAC CE. For example, theinstructions, when executed, may cause a second device to: receive, froma first UE, an SR for requesting a resource for the SL DRX command MACCE, based on the SR configuration for the SL CSI reporting MAC CE. Forexample, the SL DRX command MAC CE may be transmitted, to the second UE,based on the resource. For example, the SL DRX command MAC CE may beinformation for stopping at least one of the SL DRX onduration timer orthe SL DRX inactivity timer.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a structure of an NR system, based on an embodiment of thepresent disclosure.

FIG. 2 shows a radio protocol architecture, based on an embodiment ofthe present disclosure.

FIG. 3 shows a structure of a radio frame of an NR, based on anembodiment of the present disclosure.

FIG. 4 shows a structure of a slot of an NR frame, based on anembodiment of the present disclosure.

FIG. 5 shows an example of a BWP, based on an embodiment of the presentdisclosure.

FIG. 6 shows a procedure of performing V2X or SL communication by a UEbased on a transmission mode, based on an embodiment of the presentdisclosure.

FIG. 7 shows three cast types, based on an embodiment of the presentdisclosure.

FIG. 8 shows a resource unit for CBR measurement, based on an embodimentof the present disclosure.

FIG. 9 is a figure for explaining a problem of a method to perform an SLDRX operation, based on an embodiment of the present disclosure.

FIG. 10 is a figure for explaining a problem of a method to perform anSL DRX operation, according to an embodiment of the present disclosure.

FIG. 11 is a figure for explaining a method to perform an SL DRXoperation according to an embodiment of the present disclosure.

FIG. 12 shows a method for a first device to perform wirelesscommunication, according to an embodiment of the present disclosure.

FIG. 13 shows a method for a second device to perform wirelesscommunication according to an embodiment of the present disclosure.

FIG. 14 shows a communication system 1, based on an embodiment of thepresent disclosure.

FIG. 15 shows wireless devices, based on an embodiment of the presentdisclosure.

FIG. 16 shows a signal process circuit for a transmission signal, basedon an embodiment of the present disclosure.

FIG. 17 shows another example of a wireless device, based on anembodiment of the present disclosure.

FIG. 18 shows a hand-held device, based on an embodiment of the presentdisclosure.

FIG. 19 shows a vehicle or an autonomous vehicle, based on an embodimentof the present disclosure.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

In the present disclosure, “A or B” may mean “only A”, “only B” or “bothA and B.” In other words, in the present disclosure, “A or B” may beinterpreted as “A and/or B”. For example, in the present disclosure, “A,B, or C” may mean “only A”, “only B”, “only C”, or “any combination ofA, B, C”.

A slash (/) or comma used in the present disclosure may mean “and/or”.For example, “A/B” may mean “A and/or B”. Accordingly, “A/B” may mean“only A”, “only B”, or “both A and B”. For example, “A, B, C” may mean“A, B, or C”.

In the present disclosure, “at least one of A and B” may mean “only A”,“only B”, or “both A and B”. In addition, in the present disclosure, theexpression “at least one of A or B” or “at least one of A and/or B” maybe interpreted as “at least one of A and B”.

In addition, in the present disclosure, “at least one of A, B, and C”may mean “only A”, “only B”, “only C”, or “any combination of A, B, andC”. In addition, “at least one of A, B, or C” or “at least one of A, B,and/or C” may mean “at least one of A, B, and C”.

In addition, a parenthesis used in the present disclosure may mean “forexample”. Specifically, when indicated as “control information (PDCCH)”,it may mean that “PDCCH” is proposed as an example of the “controlinformation”. In other words, the “control information” of the presentdisclosure is not limited to “PDCCH”, and “PDCCH” may be proposed as anexample of the “control information”. In addition, when indicated as“control information (i.e., PDCCH)”, it may also mean that “PDCCH” isproposed as an example of the “control information”.

In the following description, ‘when, if, or in case of’ may be replacedwith ‘based on’.

A technical feature described individually in one figure in the presentdisclosure may be individually implemented, or may be simultaneouslyimplemented.

In the present disclosure, a higher layer parameter may be a parameterwhich is configured, pre-configured or pre-defined for a UE. Forexample, a base station or a network may transmit the higher layerparameter to the UE. For example, the higher layer parameter may betransmitted through radio resource control (RRC) signaling or mediumaccess control (MAC) signaling.

The technology described below may be used in various wirelesscommunication systems such as code division multiple access (CDMA),frequency division multiple access (FDMA), time division multiple access(TDMA), orthogonal frequency division multiple access (OFDMA), singlecarrier frequency division multiple access (SC-FDMA), and so on. TheCDMA may be implemented with a radio technology, such as universalterrestrial radio access (UTRA) or CDMA-2000. The TDMA may beimplemented with a radio technology, such as global system for mobilecommunications (GSM)/general packet ratio service (GPRS)/enhanced datarate for GSM evolution (EDGE). The OFDMA may be implemented with a radiotechnology, such as institute of electrical and electronics engineers(IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, evolved UTRA(E-UTRA), and so on. IEEE 802.16m is an evolved version of IEEE 802.16eand provides backward compatibility with a system based on the IEEE802.16e. The UTRA is part of a universal mobile telecommunication system(UMTS). 3rd generation partnership project (3GPP) long term evolution(LTE) is part of an evolved UMTS (E-UMTS) using the E-UTRA. The 3GPP LTEuses the OFDMA in a downlink and uses the SC-FDMA in an uplink.LTE-advanced (LTE-A) is an evolution of the LTE.

5G NR is a successive technology of LTE-A corresponding to a newClean-slate type mobile communication system having the characteristicsof high performance, low latency, high availability, and so on. 5G NRmay use resources of all spectrum available for usage including lowfrequency bands of less than 1 GHz, middle frequency bands ranging from1 GHz to 10 GHz, high frequency (millimeter waves) of 24 GHz or more,and so on.

For clarity in the description, the following description will mostlyfocus on LTE-A or 5G NR. However, technical features according to anembodiment of the present disclosure will not be limited only to this.

FIG. 1 shows a structure of an NR system, based on an embodiment of thepresent disclosure. The embodiment of FIG. 1 may be combined withvarious embodiments of the present disclosure.

Referring to FIG. 1 , a next generation-radio access network (NG-RAN)may include a BS 20 providing a UE 10 with a user plane and controlplane protocol termination. For example, the BS 20 may include a nextgeneration-Node B (gNB) and/or an evolved-NodeB (eNB). For example, theUE 10 may be fixed or mobile and may be referred to as other terms, suchas a mobile station (MS), a user terminal (UT), a subscriber station(SS), a mobile terminal (MT), wireless device, and so on. For example,the BS may be referred to as a fixed station which communicates with theUE 10 and may be referred to as other terms, such as a base transceiversystem (BTS), an access point (AP), and so on.

The embodiment of FIG. 1 exemplifies a case where only the gNB isincluded. The BSs 20 may be connected to one another via Xn interface.The BS 20 may be connected to one another via 5th generation (5G) corenetwork (5GC) and NG interface. More specifically, the BSs 20 may beconnected to an access and mobility management function (AMF) 30 viaNG-C interface, and may be connected to a user plane function (UPF) 30via NG-U interface.

Layers of a radio interface protocol between the UE and the network canbe classified into a first layer (layer 1, L1), a second layer (layer 2,L2), and a third layer (layer 3, L3) based on the lower three layers ofthe open system interconnection (OSI) model that is well-known in thecommunication system. Among them, a physical (PHY) layer belonging tothe first layer provides an information transfer service by using aphysical channel, and a radio resource control (RRC) layer belonging tothe third layer serves to control a radio resource between the UE andthe network. For this, the RRC layer exchanges an RRC message betweenthe UE and the BS.

FIG. 2 shows a radio protocol architecture, based on an embodiment ofthe present disclosure. The embodiment of FIG. 2 may be combined withvarious embodiments of the present disclosure. Specifically, (a) of FIG.2 shows a radio protocol stack of a user plane for Uu communication, and(b) of FIG. 2 shows a radio protocol stack of a control plane for Uucommunication. (c) of FIG. 2 shows a radio protocol stack of a userplane for SL communication, and (d) of FIG. 2 shows a radio protocolstack of a control plane for SL communication.

Referring to FIG. 2 , a physical layer provides an upper layer with aninformation transfer service through a physical channel. The physicallayer is connected to a medium access control (MAC) layer which is anupper layer of the physical layer through a transport channel. Data istransferred between the MAC layer and the physical layer through thetransport channel. The transport channel is classified according to howand with what characteristics data is transmitted through a radiointerface.

Between different physical layers, i.e., a physical layer of atransmitter and a physical layer of a receiver, data are transferredthrough the physical channel. The physical channel is modulated using anorthogonal frequency division multiplexing (OFDM) scheme, and utilizestime and frequency as a radio resource.

The MAC layer provides services to a radio link control (RLC) layer,which is a higher layer of the MAC layer, via a logical channel. The MAClayer provides a function of mapping multiple logical channels tomultiple transport channels. The MAC layer also provides a function oflogical channel multiplexing by mapping multiple logical channels to asingle transport channel. The MAC layer provides data transfer servicesover logical channels.

The RLC layer performs concatenation, segmentation, and reassembly ofRadio Link Control Service Data Unit (RLC SDU). In order to ensurediverse quality of service (QoS) required by a radio bearer (RB), theRLC layer provides three types of operation modes, i.e., a transparentmode (TM), an unacknowledged mode (UM), and an acknowledged mode (AM).An AM RLC provides error correction through an automatic repeat request(ARQ).

A radio resource control (RRC) layer is defined only in the controlplane. The RRC layer serves to control the logical channel, thetransport channel, and the physical channel in association withconfiguration, reconfiguration and release of RBs. The RB is a logicalpath provided by the first layer (i.e., the physical layer or the PHYlayer) and the second layer (i.e., a MAC layer, an RLC layer, a packetdata convergence protocol (PDCP) layer, and a service data adaptationprotocol (SDAP) layer) for data delivery between the UE and the network.

Functions of a packet data convergence protocol (PDCP) layer in the userplane include user data delivery, header compression, and ciphering.Functions of a PDCP layer in the control plane include control-planedata delivery and ciphering/integrity protection.

A service data adaptation protocol (SDAP) layer is defined only in auser plane. The SDAP layer performs mapping between a Quality of Service(QoS) flow and a data radio bearer (DRB) and QoS flow ID (QFI) markingin both DL and UL packets.

The configuration of the RB implies a process for specifying a radioprotocol layer and channel properties to provide a particular serviceand for determining respective detailed parameters and operations. TheRB can be classified into two types, i.e., a signaling RB (SRB) and adata RB (DRB). The SRB is used as a path for transmitting an RRC messagein the control plane. The DRB is used as a path for transmitting userdata in the user plane.

When an RRC connection is established between an RRC layer of the UE andan RRC layer of the E-UTRAN, the UE is in an RRC CONNECTED state, and,otherwise, the UE may be in an RRC IDLE state. In case of the NR, an RRCINACTIVE state is additionally defined, and a UE being in the RRCINACTIVE state may maintain its connection with a core network whereasits connection with the BS is released.

Data is transmitted from the network to the UE through a downlinktransport channel. Examples of the downlink transport channel include abroadcast channel (BCH) for transmitting system information and adownlink-shared channel (SCH) for transmitting user traffic or controlmessages. Traffic of downlink multicast or broadcast services or thecontrol messages can be transmitted on the downlink-SCH or an additionaldownlink multicast channel (MCH). Data is transmitted from the UE to thenetwork through an uplink transport channel. Examples of the uplinktransport channel include a random access channel (RACH) fortransmitting an initial control message and an uplink SCH fortransmitting user traffic or control messages.

Examples of logical channels belonging to a higher channel of thetransport channel and mapped onto the transport channels include abroadcast channel (BCCH), a paging control channel (PCCH), a commoncontrol channel (CCCH), a multicast control channel (MCCH), a multicasttraffic channel (MTCH), etc.

FIG. 3 shows a structure of a radio frame of an NR, based on anembodiment of the present disclosure. The embodiment of FIG. 3 may becombined with various embodiments of the present disclosure.

Referring to FIG. 3 , in the NR, a radio frame may be used forperforming uplink and downlink transmission. A radio frame has a lengthof 10 ms and may be defined to be configured of two half-frames (HFs). Ahalf-frame may include five 1 ms subframes (SFs). A subframe (SF) may bedivided into one or more slots, and the number of slots within asubframe may be determined based on subcarrier spacing (SCS). Each slotmay include 12 or 14 OFDM(A) symbols according to a cyclic prefix (CP).

In case of using a normal CP, each slot may include 14 symbols. In caseof using an extended CP, each slot may include 12 symbols. Herein, asymbol may include an OFDM symbol (or CP-OFDM symbol) and a SingleCarrier-FDMA (SC-FDMA) symbol (or Discrete Fourier Transform-spread-OFDM(DFT-s-OFDM) symbol).

Table 1 shown below represents an example of a number of symbols perslot (Nslotsymb), a number slots per frame (Nframe,uslot), and a numberof slots per subframe (Nsubframe,uslot) based on an SCS configuration(u), in a case where a normal CP is used.

TABLE 1 SCS (15*2^(u)) N_(symb) ^(slot) N_(slot) ^(frame,u) N_(slot)^(subframe,u)  15 KHz (u = 0) 14 10 1  30 KHz (u = 1) 14 20 2  60 KHz (u= 2) 14 40 4 120 KHz (u = 3) 14 80 8 240 KHz (u = 4) 14 160 16

Table 2 shows an example of a number of symbols per slot, a number ofslots per frame, and a number of slots per subframe based on the SCS, ina case where an extended CP is used.

TABLE 2 SCS (15*2^(u)) N_(symb) ^(slot) N_(slot) ^(frame,u) N_(slot)^(subframe,u) 60 KHz (u = 2) 12 40 4

In an NR system, OFDM(A) numerologies (e.g., SCS, CP length, and so on)between multiple cells being integrate to one UE may be differentlyconfigured. Accordingly, a (absolute time) duration (or section) of atime resource (e.g., subframe, slot or TTI) (collectively referred to asa time unit (TU) for simplicity) being configured of the same number ofsymbols may be differently configured in the integrated cells.

In the NR, multiple numerologies or SCSs for supporting diverse 5Gservices may be supported. For example, in case an SCS is 15 kHz, a widearea of the conventional cellular bands may be supported, and, in casean SCS is 30 kHz/60 kHz a dense-urban, lower latency, wider carrierbandwidth may be supported. In case the SCS is 60 kHz or higher, abandwidth that is greater than 24.25 GHz may be used in order toovercome phase noise.

An NR frequency band may be defined as two different types of frequencyranges. The two different types of frequency ranges may be FR1 and FR2.The values of the frequency ranges may be changed (or varied), and, forexample, the two different types of frequency ranges may be as shownbelow in Table 3. Among the frequency ranges that are used in an NRsystem, FR1 may mean a “sub 6 GHz range”, and FR2 may mean an “above 6GHz range” and may also be referred to as a millimeter wave (mmW).

TABLE 3 Frequency Range Corresponding Subcarrier designation frequencyrange Spacing (SCS) FR1  450 MHz-6000 MHz  15, 30, 60 kHz FR2 24250MHz-52600 MHz 60, 120, 240 kHz

As described above, the values of the frequency ranges in the NR systemmay be changed (or varied). For example, as shown below in Table 4, FR1may include a band within a range of 410 MHz to 7125 MHz. Morespecifically, FR1 may include a frequency band of 6 GHz (or 5850, 5900,5925 MHz, and so on) and higher. For example, a frequency band of 6 GHz(or 5850, 5900, 5925 MHz, and so on) and higher being included in FR1mat include an unlicensed band. The unlicensed band may be used fordiverse purposes, e.g., the unlicensed band for vehicle-specificcommunication (e.g., automated driving).

TABLE 4 Frequency Range Corresponding Subcarrier designation frequencyrange Spacing (SCS) FR1  410 MHz-7125 MHz  15, 30, 60 kHz FR2 24250MHz-52600 MHz 60, 120, 240 kHz

FIG. 4 shows a structure of a slot of an NR frame, based on anembodiment of the present disclosure. The embodiment of FIG. 4 may becombined with various embodiments of the present disclosure.

Referring to FIG. 4 , a slot includes a plurality of symbols in a timedomain. For example, in case of a normal CP, one slot may include 14symbols. However, in case of an extended CP, one slot may include 12symbols. Alternatively, in case of a normal CP, one slot may include 7symbols. However, in case of an extended CP, one slot may include 6symbols.

A carrier includes a plurality of subcarriers in a frequency domain. AResource Block (RB) may be defined as a plurality of consecutivesubcarriers (e.g., 12 subcarriers) in the frequency domain. A BandwidthPart (BWP) may be defined as a plurality of consecutive (Physical)Resource Blocks ((P)RBs) in the frequency domain, and the BWP maycorrespond to one numerology (e.g., SCS, CP length, and so on). Acarrier may include a maximum of N number BWPs (e.g., 5 BWPs). Datacommunication may be performed via an activated BWP. Each element may bereferred to as a Resource Element (RE) within a resource grid and onecomplex symbol may be mapped to each element.

Hereinafter, a bandwidth part (BWP) and a carrier will be described.

The BWP may be a set of consecutive physical resource blocks (PRBs) in agiven numerology. The PRB may be selected from consecutive sub-sets ofcommon resource blocks (CRBs) for the given numerology on a givencarrier.

For example, the BWP may be at least any one of an active BWP, aninitial BWP, and/or a default BWP. For example, the UE may not monitordownlink radio link quality in a DL BWP other than an active DL BWP on aprimary cell (PCell). For example, the UE may not receive PDCCH,physical downlink shared channel (PDSCH), or channel stateinformation-reference signal (CSI-RS) (excluding RRM) outside the activeDL BWP. For example, the UE may not trigger a channel state information(CSI) report for the inactive DL BWP. For example, the UE may nottransmit physical uplink control channel (PUCCH) or physical uplinkshared channel (PUSCH) outside an active UL BWP. For example, in adownlink case, the initial BWP may be given as a consecutive RB set fora remaining minimum system information (RMSI) control resource set(CORESET) (configured by physical broadcast channel (PBCH)). Forexample, in an uplink case, the initial BWP may be given by systeminformation block (SIB) for a random access procedure. For example, thedefault BWP may be configured by a higher layer. For example, an initialvalue of the default BWP may be an initial DL BWP. For energy saving, ifthe UE fails to detect downlink control information (DCI) during aspecific period, the UE may switch the active BWP of the UE to thedefault BWP.

Meanwhile, the BWP may be defined for SL. The same SL BWP may be used intransmission and reception. For example, a transmitting UE may transmitan SL channel or an SL signal on a specific BWP, and a receiving UE mayreceive the SL channel or the SL signal on the specific BWP. In alicensed carrier, the SL BWP may be defined separately from a Uu BWP,and the SL BWP may have configuration signaling separate from the UuBWP. For example, the UE may receive a configuration for the SL BWP fromthe BS/network. For example, the UE may receive a configuration for theUu BWP from the BS/network. The SL BWP may be (pre-)configured in acarrier with respect to an out-of-coverage NR V2X UE and an RRC IDLE UE.For the UE in the RRC CONNECTED mode, at least one SL BWP may beactivated in the carrier.

FIG. 5 shows an example of a BWP, based on an embodiment of the presentdisclosure. The embodiment of FIG. 5 may be combined with variousembodiments of the present disclosure. It is assumed in the embodimentof FIG. 5 that the number of BWPs is 3.

Referring to FIG. 5 , a common resource block (CRB) may be a carrierresource block numbered from one end of a carrier band to the other endthereof. In addition, the PRB may be a resource block numbered withineach BWP. A point A may indicate a common reference point for a resourceblock grid.

The BWP may be configured by a point A, an offset NstartBWP from thepoint A, and a bandwidth NsizeBWP. For example, the point A may be anexternal reference point of a PRB of a carrier in which a subcarrier 0of all numerologies (e.g., all numerologies supported by a network onthat carrier) is aligned. For example, the offset may be a PRB intervalbetween a lowest subcarrier and the point A in a given numerology. Forexample, the bandwidth may be the number of PRBs in the givennumerology.

Hereinafter, V2X or SL communication will be described.

A sidelink synchronization signal (SLSS) may include a primary sidelinksynchronization signal (PSSS) and a secondary sidelink synchronizationsignal (SSSS), as an SL-specific sequence. The PSSS may be referred toas a sidelink primary synchronization signal (S-PSS), and the SSSS maybe referred to as a sidelink secondary synchronization signal (S-SSS).For example, length-127 M-sequences may be used for the S-PSS, andlength-127 gold sequences may be used for the S-SSS. For example, a UEmay use the S-PSS for initial signal detection and for synchronizationacquisition. For example, the UE may use the S-PSS and the S-SSS foracquisition of detailed synchronization and for detection of asynchronization signal ID.

A physical sidelink broadcast channel (PSBCH) may be a (broadcast)channel for transmitting default (system) information which must befirst known by the UE before SL signal transmission/reception. Forexample, the default information may be information related to SLSS, aduplex mode (DM), a time division duplex (TDD) uplink/downlink (UL/DL)configuration, information related to a resource pool, a type of anapplication related to the SLSS, a subframe offset, broadcastinformation, or the like. For example, for evaluation of PSBCHperformance, in NR V2X, a payload size of the PSBCH may be 56 bitsincluding 24-bit cyclic redundancy check (CRC).

The S-PSS, the S-SSS, and the PSBCH may be included in a block format(e.g., SL synchronization signal (SS)/PSBCH block, hereinafter,sidelink-synchronization signal block (S-SSB)) supporting periodicaltransmission. The S-SSB may have the same numerology (i.e., SCS and CPlength) as a physical sidelink control channel (PSCCH)/physical sidelinkshared channel (PSSCH) in a carrier, and a transmission bandwidth mayexist within a (pre-)configured sidelink (SL) BWP. For example, theS-SSB may have a bandwidth of 11 resource blocks (RBs). For example, thePSBCH may exist across 11 RBs. In addition, a frequency position of theS-SSB may be (pre-)configured. Accordingly, the UE does not have toperform hypothesis detection at frequency to discover the S-SSB in thecarrier.

FIG. 6 shows a procedure of performing V2X or SL communication by a UEbased on a transmission mode, based on an embodiment of the presentdisclosure. The embodiment of FIG. 6 may be combined with variousembodiments of the present disclosure. In various embodiments of thepresent disclosure, the transmission mode may be called a mode or aresource allocation mode. Hereinafter, for convenience of explanation,in LTE, the transmission mode may be called an LTE transmission mode. InNR, the transmission mode may be called an NR resource allocation mode.

For example, (a) of FIG. 6 shows a UE operation related to an LTEtransmission mode 1 or an LTE transmission mode 3. Alternatively, forexample, (a) of FIG. 6 shows a UE operation related to an NR resourceallocation mode 1. For example, the LTE transmission mode 1 may beapplied to general SL communication, and the LTE transmission mode 3 maybe applied to V2X communication.

For example, (b) of FIG. 6 shows a UE operation related to an LTEtransmission mode 2 or an LTE transmission mode 4. Alternatively, forexample, (b) of FIG. 6 shows a UE operation related to an NR resourceallocation mode 2.

Referring to (a) of FIG. 6 , in the LTE transmission mode 1, the LTEtransmission mode 3, or the NR resource allocation mode 1, a basestation may schedule SL resource(s) to be used by a UE for SLtransmission. For example, in step S600, a base station may transmitinformation related to SL resource(s) and/or information related to ULresource(s) to a first UE. For example, the UL resource(s) may includePUCCH resource(s) and/or PUSCH resource(s). For example, the ULresource(s) may be resource(s) for reporting SL HARQ feedback to thebase station.

For example, the first UE may receive information related to dynamicgrant (DG) resource(s) and/or information related to configured grant(CG) resource(s) from the base station. For example, the CG resource(s)may include CG type 1 resource(s) or CG type 2 resource(s). In thepresent disclosure, the DG resource(s) may be resource(s)configured/allocated by the base station to the first UE through adownlink control information (DCI). In the present disclosure, the CGresource(s) may be (periodic) resource(s) configured/allocated by thebase station to the first UE through a DCI and/or an RRC message. Forexample, in the case of the CG type 1 resource(s), the base station maytransmit an RRC message including information related to CG resource(s)to the first UE. For example, in the case of the CG type 2 resource(s),the base station may transmit an RRC message including informationrelated to CG resource(s) to the first UE, and the base station maytransmit a DCI related to activation or release of the CG resource(s) tothe first UE.

In step S610, the first UE may transmit a PSCCH (e.g., sidelink controlinformation (SCI) or 1st-stage SCI) to a second UE based on the resourcescheduling. In step S620, the first UE may transmit a PSSCH (e.g.,2nd-stage SCI, MAC PDU, data, etc.) related to the PSCCH to the secondUE. In step S630, the first UE may receive a PSFCH related to thePSCCH/PSSCH from the second UE. For example, HARQ feedback information(e.g., NACK information or ACK information) may be received from thesecond UE through the PSFCH. In step S640, the first UE maytransmit/report HARQ feedback information to the base station throughthe PUCCH or the PUSCH. For example, the HARQ feedback informationreported to the base station may be information generated by the firstUE based on the HARQ feedback information received from the second UE.For example, the HARQ feedback information reported to the base stationmay be information generated by the first UE based on a pre-configuredrule. For example, the DCI may be a DCI for SL scheduling. For example,a format of the DCI may be a DCI format 3_0 or a DCI format 3_1.

Hereinafter, an example of DCI format 3_0 will be described.

DCI format 3_0 is used for scheduling of NR PSCCH and NR PSSCH in onecell.

The following information is transmitted by means of the DCI format 3_0with CRC scrambled by SL-RNTI or SL-CS-RNTI:

-   -   Resource pool index—ceiling (log₂ I) bits, where I is the number        of resource pools for transmission configured by the higher        layer parameter sl-TxPoolScheduling.    -   Time gap—3 bits determined by higher layer parameter        sl-DCI-ToSL-Trans    -   HARQ process number—4 bits    -   New data indicator—1 bit    -   Lowest index of the subchannel allocation to the initial        transmission—ceiling (log₂(N^(SL) _(subChannel))) bits    -   SCI format 1-A fields: frequency resource assignment, time        resource assignment        -   PSFCH-to-HARQ feedback timing indicator—ceiling (log₂            N_(fb_timing)) bits, where N_(fb_timing) is the number of            entries in the higher layer parameter sl-PSFCH-ToPUCCH.        -   PUCCH resource indicator—3 bits        -   Configuration index—0 bit if the UE is not configured to            monitor DCI format 3_0 with CRC scrambled by SL-CS-RNTI;            otherwise 3 bits. If the UE is configured to monitor DCI            format 3_0 with CRC scrambled by SL-CS-RNTI, this field is            reserved for DCI format 3_0 with CRC scrambled by SL-RNTI.        -   Counter sidelink assignment index—2 bits, 2 bits if the UE            is configured with pdsch-HARQ-ACK-Codebook=dynamic, 2 bits            if the UE is configured with            pdsch-HARQ-ACK-Codebook=semi-static        -   Padding bits, if required

Referring to (b) of FIG. 6 , in the LTE transmission mode 2, the LTEtransmission mode 4, or the NR resource allocation mode 2, a UE maydetermine SL transmission resource(s) within SL resource(s) configuredby a base station/network or pre-configured SL resource(s). For example,the configured SL resource(s) or the pre-configured SL resource(s) maybe a resource pool. For example, the UE may autonomously select orschedule resource(s) for SL transmission. For example, the UE mayperform SL communication by autonomously selecting resource(s) withinthe configured resource pool. For example, the UE may autonomouslyselect resource(s) within a selection window by performing a sensingprocedure and a resource (re)selection procedure. For example, thesensing may be performed in a unit of subchannel(s). For example, instep S610, a first UE which has selected resource(s) from a resourcepool by itself may transmit a PSCCH (e.g., sidelink control information(SCI) or 1st-stage SCI) to a second UE by using the resource(s). In stepS620, the first UE may transmit a PSSCH (e.g., 2nd-stage SCI, MAC PDU,data, etc.) related to the PSCCH to the second UE. In step S630, thefirst UE may receive a PSFCH related to the PSCCH/PSSCH from the secondUE.

Referring to (a) or (b) of FIG. 6 , for example, the first UE maytransmit a SCI to the second UE through the PSCCH. Alternatively, forexample, the first UE may transmit two consecutive SCIs (e.g., 2-stageSCI) to the second UE through the PSCCH and/or the PSSCH. In this case,the second UE may decode two consecutive SCIs (e.g., 2-stage SCI) toreceive the PSSCH from the first UE. In the present disclosure, a SCItransmitted through a PSCCH may be referred to as a 1st SCI, a firstSCI, a 1st-stage SCI or a 1st-stage SCI format, and a SCI transmittedthrough a PSSCH may be referred to as a 2nd SCI, a second SCI, a2nd-stage SCI or a 2nd-stage SCI format. For example, the 1st-stage SCIformat may include a SCI format 1-A, and the 2nd-stage SCI format mayinclude a SCI format 2-A and/or a SCI format 2-B.

Hereinafter, an example of SCI format 1-A will be described.

SCI format 1-A is used for the scheduling of PSSCH and 2nd-stage-SCI onPSSCH.

The following information is transmitted by means of the SCI format 1-A:

-   -   Priority—3 bits    -   Frequency resource assignment—ceiling (log₂(N^(SL)        _(subChannel)(N^(SL) _(subChannel)+1)/2)) bits when the value of        the higher layer parameter sl-MaxNumPerReserve is configured to        2; otherwise ceiling log₂(N^(SL) _(subChannel)(N^(SL)        _(subChannel)+1)(2N^(SL) _(subChannel)+1)/6) bits when the value        of the higher layer parameter sl-MaxNumPerReserve is configured        to 3    -   Time resource assignment—5 bits when the value of the higher        layer parameter sl-MaxNumPerReserve is configured to 2;        otherwise 9 bits when the value of the higher layer parameter        sl-MaxNumPerReserve is configured to 3    -   Resource reservation period—ceiling (log₂ N_(rsv_period)) bits,        where N_(rsv_period) is the number of entries in the higher        layer parameter sl-ResourceReservePeriodList, if higher layer        parameter sl-MultiReserveResource is configured; 0 bit otherwise    -   DMRS pattern—ceiling (log₂ N_(pattern)) bits, where N_(pattern)        is the number of DMRS patterns configured by higher layer        parameter sl-PSSCH-DMRS-TimePatternList    -   2nd-stage SCI format—2 bits as defined in Table 5    -   Beta_offset indicator—2 bits as provided by higher layer        parameter sl-BetaOffsets2ndSCI    -   Number of DMRS port—1 bit as defined in Table 6    -   Modulation and coding scheme—5 bits    -   Additional MCS table indicator—1 bit if one MCS table is        configured by higher layer parameter sl-Additional-MCS-Table; 2        bits if two MCS tables are configured by higher layer parameter        sl-Additional-MCS-Table; 0 bit otherwise    -   PSFCH overhead indication—1 bit if higher layer parameter        sl-PSFCH-Period=2 or 4; 0 bit otherwise    -   Reserved—a number of bits as determined by higher layer        parameter sl-NumReservedBits, with value set to zero.

TABLE 5 Value of 2nd-stage SCI format field 2nd-stage SCI format 00 SCIformat 2-A 01 SCI format 2-B 10 Reserved 11 Reserved

TABLE 6 Value of the Number of DMRS port field Antenna ports 0 1000 11000 and 1001

Hereinafter, an example of SCI format 2-A will be described.

SCI format 2-A is used for the decoding of PSSCH, with HARQ operationwhen HARQ-ACK information includes ACK or NACK, when HARQ-ACKinformation includes only NACK, or when there is no feedback of HARQ-ACKinformation.

The following information is transmitted by means of the SCI format 2-A:

-   -   HARQ process number—4 bits    -   New data indicator—1 bit    -   Redundancy version—2 bits    -   Source ID—8 bits    -   Destination ID—16 bits    -   HARQ feedback enabled/disabled indicator—1 bit    -   Cast type indicator—2 bits as defined in Table 7    -   CSI request—1 bit

TABLE 7 Value of Cast type indicator Cast type 00 Broadcast 01 Groupcastwhen HARQ-ACK information includes ACK or NACK 10 Unicast 11 Groupcastwhen HARQ-ACK information includes only NACK

Hereinafter, an example of SCI format 2-B will be described.

SCI format 2-B is used for the decoding of PSSCH, with HARQ operationwhen HARQ-ACK information includes only NACK, or when there is nofeedback of HARQ-ACK information.

The following information is transmitted by means of the SCI format 2-B:

-   -   HARQ process number—4 bits    -   New data indicator—1 bit    -   Redundancy version—2 bits    -   Source ID—8 bits    -   Destination ID—16 bits    -   HARQ feedback enabled/disabled indicator—1 bit    -   Zone ID—12 bits    -   Communication range requirement—4 bits determined by higher        layer parameter sl-ZoneConfigMCR-Index

Referring to (a) or (b) of FIG. 6 , in step S630, the first UE mayreceive the PSFCH. For example, the first UE and the second UE maydetermine a PSFCH resource, and the second UE may transmit HARQ feedbackto the first UE using the PSFCH resource.

Referring to (a) of FIG. 6 , in step S640, the first UE may transmit SLHARQ feedback to the base station through the PUCCH and/or the PUSCH.

FIG. 7 shows three cast types, in accordance with an embodiment of thepresent disclosure. The embodiment of FIG. 7 may be combined withvarious embodiments of the present disclosure. Specifically, FIG. 7(a)shows broadcast-type SL communication, FIG. 7(b) shows unicast type-SLcommunication, and FIG. 7(c) shows groupcast-type SL communication. Incase of the unicast-type SL communication, a UE may perform one-to-onecommunication with respect to another UE. In case of the groupcast-typeSL transmission, the UE may perform SL communication with respect to oneor more UEs in a group to which the UE belongs. In various embodimentsof the present disclosure, SL groupcast communication may be replacedwith SL multicast communication, SL one-to-many communication, or thelike.

Hereinafter, a hybrid automatic repeat request (HARQ) procedure will bedescribed.

For example, the SL HARQ feedback may be enabled for unicast. In thiscase, in a non-code block group (non-CBG) operation, if the receiving UEdecodes a PSCCH of which a target is the receiving UE and if thereceiving UE successfully decodes a transport block related to thePSCCH, the receiving UE may generate HARQ-ACK. In addition, thereceiving UE may transmit the HARQ-ACK to the transmitting UE.Otherwise, if the receiving UE cannot successfully decode the transportblock after decoding the PSCCH of which the target is the receiving UE,the receiving UE may generate the HARQ-NACK. In addition, the receivingUE may transmit HARQ-NACK to the transmitting UE.

For example, the SL HARQ feedback may be enabled for groupcast. Forexample, in the non-CBG operation, two HARQ feedback options may besupported for groupcast.

(1) Groupcast option 1: After the receiving UE decodes the PSCCH ofwhich the target is the receiving UE, if the receiving UE fails indecoding of a transport block related to the PSCCH, the receiving UE maytransmit HARQ-NACK to the transmitting UE through a PSFCH. Otherwise, ifthe receiving UE decodes the PSCCH of which the target is the receivingUE and if the receiving UE successfully decodes the transport blockrelated to the PSCCH, the receiving UE may not transmit the HARQ-ACK tothe transmitting UE.

(2) Groupcast option 2: After the receiving UE decodes the PSCCH ofwhich the target is the receiving UE, if the receiving UE fails indecoding of the transport block related to the PSCCH, the receiving UEmay transmit HARQ-NACK to the transmitting UE through the PSFCH. Inaddition, if the receiving UE decodes the PSCCH of which the target isthe receiving UE and if the receiving UE successfully decodes thetransport block related to the PSCCH, the receiving UE may transmit theHARQ-ACK to the transmitting UE through the PSFCH.

For example, if the groupcast option 1 is used in the SL HARQ feedback,all UEs performing groupcast communication may share a PSFCH resource.For example, UEs belonging to the same group may transmit HARQ feedbackby using the same PSFCH resource.

For example, if the groupcast option 2 is used in the SL HARQ feedback,each UE performing groupcast communication may use a different PSFCHresource for HARQ feedback transmission. For example, UEs belonging tothe same group may transmit HARQ feedback by using different PSFCHresources.

In the present disclosure, HARQ-ACK may be referred to as ACK, ACKinformation, or positive-ACK information, and HARQ-NACK may be referredto as NACK, NACK information, or negative-ACK information.

Hereinafter, UE procedure for reporting HARQ-ACK on sidelink will bedescribed.

A UE can be indicated by an SCI format scheduling a PSSCH reception, inone or more sub-channels from a number of NPSSCHsubch sub-channels, totransmit a PSFCH with HARQ-ACK information in response to the PSSCHreception. The UE provides HARQ-ACK information that includes ACK orNACK, or only NACK.

A UE can be provided, by sl-PSFCH-Period-r16, a number of slots in aresource pool for a period of PSFCH transmission occasion resources. Ifthe number is zero, PSFCH transmissions from the UE in the resource poolare disabled. A UE expects that a slot t′kSL (0≤k<T′max) has a PSFCHtransmission occasion resource if k mod NPSFCHPSSCH=0, where t′kSL is aslot that belongs to the resource pool, T′max is a number of slots thatbelong to the resource pool within 10240 msec, and NPSFCHPSSCH isprovided by sl-PSFCH-Period-r16. A UE may be indicated by higher layersto not transmit a PSFCH in response to a PSSCH reception. If a UEreceives a PSSCH in a resource pool and the HARQ feedbackenabled/disabled indicator field in an associated SCI format 2-A or aSCI format 2-B has value 1, the UE provides the HARQ-ACK information ina PSFCH transmission in the resource pool. The UE transmits the PSFCH ina first slot that includes PSFCH resources and is at least a number ofslots, provided by sl-MinTimeGapPSFCH-r16, of the resource pool after alast slot of the PSSCH reception.

A UE is provided by sl-PSFCH-RB-Set-r16 a set of MPSFCHPRB,set PRBs in aresource pool for PSFCH transmission in a PRB of the resource pool. Fora number of Nsubch sub-channels for the resource pool, provided bysl-NumSubchannel, and a number of PSSCH slots associated with a PSFCHslot that is less than or equal to NPSFCHPSSCH, the UE allocates the[(i+j·NPSFCHPSSCH)·MPSFCHsubch,slot,(i+1+j·NPSFCHPSSCH)MPSFCHsubch,slot−1] PRBs from the MPRB,setPSFCH PRBsto slot i among the PSSCH slots associated with the PSFCH slot andsub-channel j, whereMPSFCHsubch,slot=MPSFCHPRB,set/(Nsubch·NPSFCHPSSCH), 0≤i<NPSFCHPSSCH,0≤j<Nsubch, and the allocation starts in an ascending order of i andcontinues in an ascending order of j. The UE expects that MPSFCHPRB,setis a multiple of Nsubch·NPSFCHPSSCH.

A UE determines a number of PSFCH resources available for multiplexingHARQ-ACK information in a PSFCH transmission asRPSFCHPRB,CS=NPSFCHtype·MPSFCHsubch,slot·NPSFCHCS where NPSFCHCS is anumber of cyclic shift pairs for the resource pool and, based on anindication by higher layers,

-   -   NPSFCHtype=1 and the MPSFCHsubch,slot PRBs are associated with        the starting sub-channel of the corresponding PSSCH    -   NPSFCHtype=NPSSCHsubch and the NPSSCHsubch·MPSFCHsubch,slot PRBs        are associated with one or more sub-channels from the        NPSSCHsubch sub-channels of the corresponding PSSCH

The PSFCH resources are first indexed according to an ascending order ofthe PRB index, from the NPSFCHtype·MPSFCHsubch,slot PRBs, and thenaccording to an ascending order of the cyclic shift pair index from theNPSFCHCS cyclic shift pairs.

A UE determines an index of a PSFCH resource for a PSFCH transmission inresponse to a PSSCH reception as (PID+MID) mod RPSFCHPRB,CS where PID isa physical layer source ID provided by SCI format 2-A or 2-B schedulingthe PSSCH reception, and MID is the identity of the UE receiving thePSSCH as indicated by higher layers if the UE detects a SCI format 2-Awith Cast type indicator field value of “01”; otherwise, MID is zero.

A UE determines a m0 value, for computing a value of cyclic shift α,from a cyclic shift pair index corresponding to a PSFCH resource indexand from NPSFCHCS using Table 8.

TABLE 8 m₀ cyclic cyclic cyclic cyclic cyclic cyclic shift shift shiftshift shift shift pair pair pair pair pair pair index index index indexindex index N_(CS) ^(PSFCH) 0 1 2 3 4 5 1 0 — — — — — 2 0 3 — — — — 3 02 4 — — — 6 0 1 2 3 4 5

A UE determines a mcs value, for computing a value of cyclic shift α, asin Table 9 if the UE detects a SCI format 2-A with Cast type indicatorfield value of “01” or “10”, or as in Table 10 if the UE detects a SCIformat 2-B or a SCI format 2-A with Cast type indicator field value of“11”. The UE applies one cyclic shift from a cyclic shift pair to asequence used for the PSFCH transmission.

TABLE 9 HARQ-ACK Value 0 (NACK) 1 (ACK) Sequence cyclic shift 0 6

TABLE 10 HARQ-ACK Value 0 (NACK) 1 (ACK) Sequence cyclic shift 0 N/A

Hereinafter, a procedure for a UE to report HARQ-ACK in an uplink willbe described.

For reporting HARQ-ACK information generated by a UE based on HARQ-ACKinformation obtained by the UE from a PSFCH reception or from an absenceof PSFCH reception, the UE may be provided with a PUCCH resource or aPUSCH resource. A UE reports HARQ-ACK information for a primary cell ofa PUCCH group among cells in which the UE monitors a PDCCH for detectionof DCI format 3_0.

For type 1 or type 2 SL configuration grant PSSCH transmission by a UEwithin a time period provided by sl-PeriodCG, the UE generates HARQ-ACKinformation in response to PSFCH reception in order to multiplex withina PUCCH transmission occasion after the last time resource in a set oftime resources.

For each PSFCH reception opportunity among PSFCH receptionopportunities, the UE generates HARQ-ACK information to be reportedduring PUCCH or PUSCH transmission. A UE may be indicated in SCI formatto do one of the following, and a UE configures a HARQ-ACK codewordusing HARQ-ACK information if applicable. Here, as one of the followingfor a UE to perform:

-   -   if a UE receives a PSFCH related to SCI format 2-A having a cast        type indicator field value of “10”,    -   the UE generates HARQ-ACK information with the same value as the        HARQ-ACK information value determined when the UE receives a        PSFCH within a PSFCH reception opportunity, and generates a NACK        if it is determined that a PSFCH is not received within a PSFCH        reception opportunity.    -   if a UE receives a PSFCH related to SCI format 2-A in which a        cast type indicator field value is “01”,        -   among PSFCH resources corresponding to all ID M_(ID)s of a            plurality of UEs expected to receive a PSSCH, the UE            generates an ACK when determining an ACK among at least one            PSFCH reception opportunity among the number of PSFCH            reception opportunities; otherwise, the UE generates a NACK    -   if a UE receives a PSFCH related to SCI format 2-B or SCI format        2-A having a cast type indicator field value of “11”,    -   when a UE determines an absence of PSFCH reception for each        PSFCH reception opportunity among reception opportunities of        PSFCH, the UE generate an ACK; otherwise, the UE generate a        NACK.

After a UE transmits a PSSCH and receives a PSFCH in response to a PSFCHresource opportunity, a priority value of HARQ-ACK information is thesame as a priority value of a PSSCH transmission related to a PSFCHreception opportunity providing HARQ-ACK information.

When a PSFCH is not received at any PSFCH reception opportunity relatedto PSSCH transmission within a resource provided by DCI format 3_0including a CRC scrambled by SL-RNTI, due to prioritization, or if a UEis provided with PUCCH resources for reporting HARQ-ACK informationwithin resources provided within a single period for a configured grant,a UE generates a NACK. A priority value of a NACK is the same as apriority value of a PSSCH that is not transmitted due to aprioritization.

If a UE does not transmit a PSCCH including an SCI format 1-A forscheduling a PSSCH among any of resources provided by a configured grantwithin a single period, and the UE is provided with a PUCCH resource forreporting HARQ-ACK information, the UE generates an ACK. A priorityvalue of ACK is equal to the largest priority value among possiblepriority values for a configuration grant.

After the end of the last symbol of the last PSFCH receptionopportunity, to report HARQ-ACK information that starts earlier than(N+1)*(2048+144)*κ*2^(μ)*T_(c), a UE does not expect to be provided witha PUCCH resource or a PUSCH resource among several PSFCH receptionopportunities in which the UE generates HARQ-ACK information reportedduring PUCCH or PUSCH transmission.

-   -   μ=min(μ_(SL),μ_(UL)), where μ_(SL) is an SCS setting of an SL        BWP and μ_(UL) is an SCS setting of an active UL BWP of a        primary cell.    -   N is determined from μ according to Table 11.

TABLE 11 μ N 0 14 1 18 2 28  3t 32

For the number of PSFCH reception opportunities that are related toPUCCH transmission and end with n slots, a UE provides HARQ-ACKinformation generated during PUCCH transmission within n+k slotsaccording to overlapping conditions. Here, k is the number of slotsindicated by a PSFCH-to-HARQfeedback timing indicator field (if present)among DCI formats indicating a slot related to PUCCH transmission toreport HARQ-ACK information, or here, k may be provided bysl-PSFCH-ToPUCCH-CG-Type1-r16. Assuming that the start of a sidelinkframe is the same as the start of a downlink frame, k=0 corresponds tothe last slot for PUCCH transmission overlapping with the last PSFCHreception opportunity.

In the case of PSSCH transmission by a UE scheduled by a DCI format orin the case of type 2 PSSCH transmission of an SL configuration grantactivated by a DCI format, in the DCI format, a PUCCH resource indicatorfield is 0, and when a value of a PSFCH-to-HARQ feedback timingindicator field (if present) is 0, it indicates to a UE that a PUCCHresource is not provided. Regarding transmission of Type 1 PSSCH of SLconfigured grant, a PUCCH resource may be provided by sl-N1PUCCH-AN-r16and sl-PSFCH-ToPUCCH-CG-Type1-r16. If a PUCCH resource is not provided,a UE does not transmit a PUCCH including HARQ-ACK information generatedfrom among a plurality of PSFCH reception opportunities.

In the case of PUCCH transmission including HARQ-ACK information, a UEdetermines a PUCCH resource set for the HARQ-ACK information bit andthen determines a PUCCH resource. PUCCH resource determination has aPSFCH-to-HARQfeedback timing indicator field value indicating the sameslot for PUCCH transmission, the UE detects it, and is based on a PUCCHresource indicator field for the last DCI format 3_0, among DCI format3_0s related to transmitting the corresponding HARQ-ACK information in aPUCCH in which a DCI format detected by a UE for PUCCH resourcedetermination is indexed in ascending order over PDCCH monitoringoccasion indexes.

A UE does not expect to multiplex HARQ-ACK information about one or moreSL configuration grants among the same PUCCH.

A priority value of PUCCH transmission including one or more sidelinkHARQ-ACK information bits is a minimum priority value for one or moreHARQ-ACK information bits. Hereinafter, a CRC for DCI format 3_0 isscrambled to SL-RNTI or SL-CS-RNTI.

Hereinafter, SL measurement and reporting will be described.

For the purpose of QoS prediction, initial transmission parametersetting, link adaptation, link management, admission control, or thelike, SL measurement and reporting (e.g., RSRP, RSRQ) between UEs may beconsidered in SL. For example, a receiving UE may receive a referencesignal from a transmitting UE, and the receiving UE may measure achannel state for the transmitting UE based on the reference signal. Inaddition, the receiving UE may report channel state information (CSI) tothe transmitting UE. SL-related measurement and reporting may includemeasurement and reporting of CBR and reporting of location information.Examples of channel status information (CSI) for V2X may include achannel quality indicator (CQI), a precoding matrix index (PM), a rankindicator (RI), reference signal received power (RSRP), reference signalreceived quality (RSRQ), pathgain/pathloss, a sounding reference symbol(SRS) resource indicator (SRI), a SRI-RS resource indicator (CRI), aninterference condition, a vehicle motion, or the like. In case ofunicast communication, CQI, RI, and PMI or some of them may be supportedin a non-subband-based aperiodic CSI report under the assumption of fouror less antenna ports. A CSI procedure may not be dependent on astandalone reference signal (RS). A CSI report may be activated ordeactivated based on a configuration.

For example, the transmitting UE may transmit CSI-RS to the receivingUE, and the receiving UE may measure CQI or RI based on the CSI-RS. Forexample, the CSI-RS may be referred to as SL CSI-RS. For example, theCSI-RS may be confined within PSSCH transmission. For example, thetransmitting UE may perform transmission to the receiving UE byincluding the CSI-RS on the PSSCH.

Hereinafter, sidelink (SL) congestion control will be described.

If a UE autonomously determines an SL transmission resource, the UE alsoautonomously determines a size and frequency of use for a resource usedby the UE. Of course, due to a constraint from a network or the like, itmay be restricted to use a resource size or frequency of use, which isgreater than or equal to a specific level. However, if all UEs use arelatively great amount of resources in a situation where many UEs areconcentrated in a specific region at a specific time, overallperformance may significantly deteriorate due to mutual interference.

Accordingly, the UE may need to observe a channel situation. If it isdetermined that an excessively great amount of resources are consumed,it is preferable that the UE autonomously decreases the use ofresources. In the present disclosure, this may be defined as congestioncontrol (CR). For example, the UE may determine whether energy measuredin a unit time/frequency resource is greater than or equal to a specificlevel, and may adjust an amount and frequency of use for itstransmission resource based on a ratio of the unit time/frequencyresource in which the energy greater than or equal to the specific levelis observed. In the present disclosure, the ratio of the time/frequencyresource in which the energy greater than or equal to the specific levelis observed may be defined as a channel busy ratio (CBR). The UE maymeasure the CBR for a channel/frequency. Additionally, the UE maytransmit the measured CBR to the network/BS.

FIG. 12 shows a resource unit for CBR measurement, based on anembodiment of the present disclosure. The embodiment of FIG. 12 may becombined with various embodiments of the present disclosure.

Referring to FIG. 12 , CBR may denote the number of sub-channels inwhich a measurement result value of a received signal strength indicator(RSSI) has a value greater than or equal to a pre-configured thresholdas a result of measuring the RSSI by a UE on a sub-channel basis for aspecific period (e.g., 100 ms). Alternatively, the CBR may denote aratio of sub-channels having a value greater than or equal to apre-configured threshold among sub-channels for a specific duration. Forexample, in the embodiment of FIG. 12 , if it is assumed that a hatchedsub-channel is a sub-channel having a value greater than or equal to apre-configured threshold, the CBR may denote a ratio of the hatchedsub-channels for a period of 100 ms. Additionally, the UE may report theCBR to the BS.

Further, congestion control considering a priority of traffic (e.g.,packet) may be necessary. To this end, for example, the UE may measure achannel occupancy ratio (CR). Specifically, the UE may measure the CBR,and the UE may determine a maximum value CRlimitk of a channel occupancyratio k (CRk) that can be occupied by traffic corresponding to eachpriority (e.g., k) based on the CBR. For example, the UE may derive themaximum value CRlimitk of the channel occupancy ratio with respect to apriority of each traffic, based on a predetermined table of CBRmeasurement values. For example, in case of traffic having a relativelyhigh priority, the UE may derive a maximum value of a relatively greatchannel occupancy ratio. Thereafter, the UE may perform congestioncontrol by restricting a total sum of channel occupancy ratios oftraffic, of which a priority k is lower than i, to a value less than orequal to a specific value. Based on this method, the channel occupancyratio may be more strictly restricted for traffic having a relativelylow priority.

In addition thereto, the UE may perform SL congestion control by using amethod of adjusting a level of transmit power, dropping a packet,determining whether retransmission is to be performed, adjusting atransmission RB size (Modulation and Coding Scheme (MCS) coordination),or the like.

Table 12 shows an example of SL CBR and SL RSSI.

TABLE 12 SL CBR Definition SL Channel Busy Ratio (SL CBR) measured inslot n is defined as the portion of sub-channels in the resource poolwhose SL RSSI measured by the UE exceed a (pre-)configured thresholdsensed over a CBR measurement window [n − a, n − 1], wherein a is equalto 100 or 100-2^(μ) slots, according to higher layer parametertimeWindowSize-CBR. Applicable RRC_IDLE intra-frequency, for RRC_IDLEinter-frequency, RRC_CONNECTED intra-frequency, RRC_CONNECTEDinter-frequency SL RSSI Definition Sidelink Received Signal StrengthIndicator (SL RSSI) is defined as the linear average of the totalreceived power (in [W]) observed in the configured sub-channel in OFDMsymbols of a slot configured for PSCCH and PSSCH, starting from the2^(nd) OFDM symbol. For frequency range 1, the reference point for theSL RSSI shall be the antenna connector of the UE. For frequency range 2,SL RSSI shall be measured based on the combined signal from antennaelements corresponding to a given receiver branch. For frequency range 1and 2, if receiver diversity is in use by the UE, the reported SL RSSIvalue shall not be lower than the corresponding SL RSSI of any of theindividual receiver branches. Applicable RRC_IDLE intra-frequency, forRRC_IDLE inter-frequency, RRC_CONNECTED intra-frequency, RRC_CONNECTEDinter-frequency

Referring to Table 12, the slot index may be based on a physical slotindex.

Table 13 shows an example of SL CR (Channel Occupancy Ratio).

TABLE 13 Definition Sidelink Channel Occupancy Ratio (SL CR) evaluatedat slot n is defined as the total number of sub-channels used for itstransmissions in slots [n − a, n − 1] and granted in slots [n, n + b]divided by the total number of configured sub-channels in thetransmission pool over [n − a, n + b] Applicable RRC_IDLEintra-frequency, for RRC_IDLE inter-frequency, RRC_CONNECTEDintra-frequency, RRC_CON NECTED inter-freq uency NOTE 1: a is a positiveinteger and b is 0 or a positive integer; a and b are determined by UEimplementation with a + b + 1 = 1000 or 1000 · 2^(μ) slots, according tohigher layer parameter timeWindowSize-CR, b < (a + b + 1)/2, and n + bshall not exceed the last transmission opportunity of the grant for thecurrent transmission. NOTE 2: SL CR is evaluated for each(re)transmission. NOTE 3: In evaluating SL CR, the UE shall assume thetransmission parameter used at slot n is reused according to theexisting grant(s) in slot [n + 1, n + b] without packet dropping. NOTE4: The slot index is based on physical slot index. NOTE 5: SL CR can becomputed per priority level NOTE 6: A resource is considered granted ifit is a member of a selected sidelink grant as defined in TS 38.321 [7].

An SL DRX configuration referred to in this disclosure may include atleast one or more of the following parameters.

For example, an SL DRX configuration may include one or more of theinformation listed below.

(1) For example, SL drx-onDurationTimer may be information on theduration at the beginning of a DRX Cycle. For example, a start period ofa DRX cycle may be information on a period in which a terminal operatesin an active mode to transmit or receive sidelink data.

(2) For example, SL drx-SlotOffset may be information on a delay beforestarting a drx-onDurationTimer of a DRX-on duration timer.

(3) For example, SL drx-InactivityTimer may be information on theduration after the PSCCH occasion in which a PSCCH indicates a newsidelink transmission and reception for the MAC entity. For example,when a transmitting terminal instructs PSSCH transmission through aPSCCH, the transmitting terminal operates in an active mode while an SLdrx-InactivityTimer is running, so that the transmitting terminal maytransmit PSSCH to a receiving terminal. Also, for example, when areceiving terminal is instructed that a transmitting terminal transmitsa PSSCH through PSCCH reception, the receiving terminal operates in anactive mode while SL drx-InactivityTimer is running, so that thereceiving terminal may receive the PSSCH from the transmitting terminal.

(4) For example, SL drx-RetransmissionTimer may be information on themaximum duration until a retransmission is received. For example, SLdrx-RetransmissionTimer may be configured per HARQ process.

(5) For example, SL drx-HARQ-RTT-Timer may be information on the minimumduration before an assignment for HARQ retransmission is expected by theMAC entity. For example, SL drx-HARQ-RTT-Timer may be configured perHARQ process.

(6) For example, SL drx-LongCycleStartOffset may be information on theLong DRX cycle and drx-StartOffset which defines the subframe where theLong and Short DRX Cycle starts.

(7) For example, SL drx-ShortCycle may be information on the Short DRXcycle. For example, SL drx-ShortCycle may be optional information.

(8) For example, SL drx-ShortCycleTimer may be information on theduration a UE shall follow the Short DRX cycle. For example, SLdrx-ShortCycleTimer may be optional information.

(9) For example, SL drx-StartOffset may be information about thesubframe where the SL DRX cycle starts.

(10) For example, SL drx-Cycle may be information about the SL DRXcycle.

The following SL DRX timer mentioned in this disclosure may be used forthe following purposes.

(1) SL DRX on-duration timer: A period in which a UE performing an SLDRX operation should basically operate in an active time to receive acounterpart UE's PSCCH/PSSCH.

(2) SL DRX inactivity timer: A period in which a UE performing an SL DRXoperation extends an SL DRX on-duration period, which is a period inwhich an active time is basically required to receive PSCCH/PSSCH of acounterpart UE.

For example, a UE may extend an SL DRX on-duration timer by an SL DRXinactivity timer period. Also, when a UE receives a new packet (e.g.,new PSSCH transmission) from a counterpart UE, the UE may start an SLDRX inactivity timer to extend the SL DRX on-duration timer.

For example, an SL DRX inactivity timer may be used to extend an SL DRXduration timer period, which is a period in which an RX UE performing anSL DRX operation should basically operate as an active time to receive aPSCCH/PSSCH of the other TX UE. That is, an SL DRX on-duration timer maybe extended by an SL DRX inactivity timer period. In addition, when anRX UE receives a new packet (e.g., new PSSCH transmission) from acounterpart TX UE, the RX UE may start an SL DRX inactivity timer toextend the SL DRX on-duration timer.

(3) SL DRX HARQ RTT timer: A period in which a UE performing an SL DRXoperation operates in a sleep mode until it receives a retransmissionpacket (or PSSCH assignment) transmitted by a counterpart UE.

For example, when a UE starts an SL DRX HARQ RTT timer, the UE maydetermine that a counterpart UE will not transmit a sidelinkretransmission packet to it until the SL DRX HARQ RTT timer expires, andmay operate in a sleep mode while the corresponding timer is running.For example, when a UE starts an SL DRX HARQ RTT timer, the UE may notmonitor sidelink retransmission packets from a counterpart UE until theSL DRX HARQ RTT timer expires. For example, when an RX UE that hasreceived a PSCCH/PSSCH transmitted by a TX UE transmits SL HARQ NACKfeedback, the RX UE may start an SL DRX HARQ RTT timer. In this case, anRX UE may determine that a counterpart TX UE will not transmit asidelink retransmission packet to it until an SL DRX HARQ RTT timerexpires, and the RX UE may operate in a sleep mode while thecorresponding timer is running.

(4) SL DRX retransmission timer: A timer that starts when an SL DRX HARQRTT timer expires, and a period in which a UE performing SL DRXoperation operates as an active time to receive a retransmission packet(or PSSCH assignment) transmitted by a counterpart UE.

For example, during the corresponding timer period, a UE may receive ormonitor a retransmission sidelink packet (or PSSCH assignment)transmitted by a counterpart UE. For example, an RX UE may receive ormonitor a retransmission sidelink packet (or PSSCH assignment)transmitted by a counterpart TX UE while an SL DRX retransmission timeris running.

The following Uu DRX timer mentioned in this disclosure may be used forthe following purposes.

(1) Uu DRX HARQ RTT TimerSL

For example, the Uu DRX HARQ RTT TimerSL can be used in a period inwhich the UE performing the Uu DRX operation does not have to monitorDCI (PDCCH) for SL Mode 1 operation transmitted by the base station.That is, while the Uu DRX HARQ RTT TimerSL is operating, the UE may notneed to monitor the PDCCH for SL Mode 1 operation. In other words, UuDRX HARQ RTT TimerSL may mean a minimum duration before an SLretransmission grant is expected.

(2) Uu DRX Retransmission TimerSL

For example, it can be used in a period in which a UE performing a UuDRX operation monitors DCI (PDCCH) for SL Mode 1 operation transmittedby a base station. That is, while Uu DRX Retransmission TimerSL is inoperation, the UE can monitor the PDCCH transmitted by the base stationfor SL Mode 1 operation. In other words, Uu DRX Retransmission TimerSLmay mean a maximum duration until an SL retransmission grant isreceived.

In the present disclosure, names of timers (Sidelink DRX OndurationTimer, Sidelink DRX Inactivity Timer, Sidelink DRX HARQ RTT Timer,Sidelink DRX Retransmission Timer, Uu DRX HARQ RTT TimerSL, Uu DRXRetransmission TimerSL, etc.) are exemplary, and timers that perform thesame/similar functions based on content described in each timer may beregarded as the same/similar timers regardless of their names.

Meanwhile, Sidelink DRX operation may be going to be newly supported inRelease 17 NR Sidelink operation. In the embodiment (s) of the presentdisclosure, a Sidelink DRX Command MAC CE operating method may beproposed.

According to an embodiment of the present disclosure, for example, whenthe UE receives the Sidelink DRX Command MAC CE from the peer UE, the UEmay stop the currently running SL DRX Timer (e.g., SL DRX OndurationTimer, SL DRX Inactivity Timer, SL DRX Retransmission Timer) and maytransit to the Sleep Mode (or monitoring Tx UE-transmitting PSCCH/PSSCHcan be stopped). Upon receiving the Sidelink DRX Command MAC CE, the UEmay transit to active mode at the start of the onduration timer of thenext SL DRX Cycle or resume monitoring the PSCCH/PSSCH transmitted bythe Tx UE at the start of the onduration timer.

FIG. 9 is a figure for explaining a method in which a UE performs an SLDRX operation, according to an embodiment of the present disclosure. Theembodiment of FIG. 9 may be combined with various embodiments of thepresent disclosure.

FIG. 9 is a figure for explaining a method in which a UE performs an SLDRX operation, according to an embodiment of the present disclosure. Theembodiment of FIG. 9 may be combined with various embodiments of thepresent disclosure.

Referring to FIG. 9 , in an embodiment of the present disclosure, forexample, the base station, TX UE, and/or RX UE may obtain SL DRXconfiguration including information related to a timer for active time.For example, the base station may transmit information related to SL DRXconfiguration to the TX UE. For example, the TX UE may transmitinformation related to SL DRX configuration to the RX UE. For example,SL DRX configuration(s) may be pre-configured for the TX UE and/or theRX UE.

For example, the RX UE may start a timer for active time. For example,the RX UE may perform an SL DRX operation based on the timer for theactive time.

For example, mode 1 resources (e.g., sidelink dynamic grant) may beallocated through a scheduling request (SR)/buffer status report (BSR)procedure. For example, a TX UE may trigger a BSR. For example, the TXUE may trigger SR to be allocated BSR MAC CE transmission resources. Forexample, based on the triggering of the SR, the TX UE may transmit theSR to the base station. For example, based on the transmitted SR, the TXUE may be allocated BSR transmission resources (e.g., BSR transmissiongrant) from the base station. For example, the TX UE may transmit a BSR(e.g., BSR MAC CE) for allocation of mode 1 resources to the basestation. For example, the base station may allocate mode 1 resources tothe TX UE based on the BSR.

For example, the TX UE may trigger a procedure related to the SL DRXcommand MAC CE. For example, the TX UE may trigger an SL DRX commandindication.

For example, the TX UE may transmit an SL DRX command MAC CE to the RXUE based on the resource. For example, after the RX UE receives the SLDRX command MAC CE, the RX UE may stop a timer (e.g., SL DRX on-durationtimer, SL DRX inactivity timer) for an active time being running. Forexample, after the RX UE receives the SL DRX command MAC CE, the RX UEmay stop monitoring the PSCCH/PSSCH.

Therefore, for example, according to an embodiment of the presentdisclosure, if SR and SR configuration(s) for requesting resources fortransmission of the SL DRX command MAC CE are defined, the BSRtransmission procedure may not be performed. For example, a BSRtransmission procedure may have to be followed until a separate SRconfiguration for the SL DRX command MAC CE is defined. Therefore, dueto the BSR transmission procedure, allocation of resources for the SLDRX command MAC CE, transmission of the SL DRX command MAC CE, and/orinterruption of the timer for the SL DRX active time may be delayed.

FIG. 10 is a figure for explaining a problem to perform an SL DRXoperation according to an embodiment of the present disclosure. Theembodiment of FIG. 10 may be combined with various embodiments of thepresent disclosure.

Referring to FIG. 10 , in an embodiment of the present disclosure, forexample, a TX UE may obtain a first SR (scheduling request)configuration for SL CSI reporting MAC CE. For example, the TX UEreceives a first SR configuration for SL CSI reporting MAC CE (e.g., anRRC message including the first SR configuration (e.g., RRC setupmessage, RRC resume message, RRC suspend message)) from the base stationcan do. For example, the TX UE may obtain the second SR configurationfor SL DRX command MAC CE. For example, the TX UE may receive a secondSR configuration (e.g., an RRC message including the second SRconfiguration (e.g., RRC setup message, RRC resume message, RRC suspendmessage, etc.)) for SL DRX command MAC CE from the base station. Forexample, the TX UE may establish an RRC connection with the base station(e.g., an RRC connection may be established based on an RRC messageincluding SR configuration).

For example, the base station, TX UE, and/or RX UE may obtain SL DRXconfiguration including information related to a timer for active time.For example, the base station may transmit information related to SL DRXconfiguration to the TX UE. For example, the TX UE may transmitinformation related to SL DRX configuration to the RX UE. For example,SL DRX configuration(s) may be pre-configured for the TX UE and/or theRX UE.

For example, the TX UE and/or RX UE may start a timer for active time.For example, the TX UE and/or the RX UE may perform a SL DRX operationbased on the timer for the active time.

For example, CSI reporting may be enabled. For example, the TX UE mayreceive a 1st SCI for PSSCH scheduling and a 2nd SCI from the RX UEthrough the PSCCH. For example, the TX UE may receive the second SCI andCSI-RS (reference signal) from the RX UE through the PSSCH. For example,the second SCI may include information related to the CSI request. Forexample, a field related to a CSI request may be configured to 1.

For example, the TX UE may trigger a procedure related to SL CSIreporting MAC CE. For example, a TX UE may measure a channel state foran RX UE based on CSI-RS.

For example, the TX UE may trigger the first SR. For example, the TX UEmay trigger the second SR.

For example, the TX UE may transmit the first SR for requesting thefirst resource to the base station (e.g., based on the first SRconfiguration for SL CSI reporting MAC CE). For example, the TX UE maytransmit a second SR for requesting a second resource to the basestation (e.g., based on the second SR configuration for the SL DRXcommand MAC CE). For example, the TX UE may receive information relatedto the first resource from the base station (e.g., based on sidelinkresource allocation mode 1). For example, the TX UE may receiveinformation related to the second resource from the base station (e.g.,based on sidelink resource allocation mode 1).

For example, the TX UE may transmit the SL CSI report MAC CE to the RXUE. For example, the TX UE may report channel state information (CSI) tothe RX UE based on the SL CSI reporting MAC CE.

Therefore, for example, according to an embodiment of the presentdisclosure, a procedure for allocating resources for MAC CE based on SRis performed redundantly in CSI reporting and DRX command MAC CE, sothat for SL DRX command MAC CE Signaling overhead between the TX UE andthe base station for resource allocation and signaling overhead betweenthe TX UE and the base station for allocation of resources for SL CSIreporting and MAC CE may be increased. For example, according to anembodiment of the present disclosure, a procedure for allocatingresources for MAC CE based on SR is performed redundantly in CSIreporting and DRX command MAC CE, thereby delaying transmission of SLDRX command MAC CE and the transmission delay of the SL CSI reportingMAC CE may be increased. In particular, for example, when the TX UEand/or the RX UE perform congestion control operation, due to thetransmission delay of the SL CSI report MAC CE, measurement of thechannel state required for the congestion control operation andreporting the channel state may be delayed.

According to an embodiment of the present disclosure, for example, theSL DRX Command MAC CE may be always transmitted as a HARQ FeedbackEnabled MAC PDU. That is, the UE transmitting the SL DRX Command MAC CEcan transmit the SL DRX Command MAC CE by always configuring the HARQFeedback mode to “HARQ Feedback Enabled” in SCI when transmitting the SLDRX Command MAC CE. In addition, a UE operating in mode 1 resourceallocation can always select a resource pool in which PSFCH isconfigured when transmitting SL DRX Command MAC CE.

According to an embodiment of the present disclosure, for example, uponreceiving SCI associated with transmission of the SL DRX Command MAC CEand receiving SL DRX Command MAC CE, the UE may transmit SL HARQFeedback for reception of the SL DRX Command MAC CE to the other UE. Inaddition, immediately after transmitting the SL HARQ Feedback, it ispossible to stop the operation (e.g., SL DRX On-duration Timer, SL DRXInactivity Timer, SL DRX Retransmission Timer) and transition to Sleepmode.

According to an embodiment of the present disclosure, for example, whenPUCCH is configured, and the UE that has transmitted the SL DRX CommandMAC CE receives HARQ Feedback (ACK or NACK) for the transmission of theSL DRX Command MAC CE, the UE may report ACK to the base station throughthe PUCCH so that the base station can no longer allocate resources tothe corresponding L2 Destination (The UE that received the SL DRXCommand MAC CE) or the HARQ process ID (the HARQ process ID being usedfor the resources allocated for SL TB transmission) (or reclaim theallocated resources.). In addition, when the UE transmits SR/BSR toreceive resource allocation for SL DRX Command MAC CE transmission, thebase station may allocate a dynamic grant for SL DRX Command MAC CEtransmission to the UE as a resource configured with PUCCH resources.

According to an embodiment of the present disclosure, for example, theUE that has transmitted the SL DRX Command MAC CE is allowed to cancelthe pending SR/BSR when there is a pending SR/BSR (SR/BSR triggered byavailable SL Data but not yet transmitted).

According to an embodiment of the present disclosure, for example, for alogical channel for SL DRX Command MAC CE, PUCCH resource for at leastor at most one SR transmission can be configured per UL BWP.

According to an embodiment of the present disclosure, for example, SLDRX Command MAC CE may be always transmitted in a standalone manner.That is, it is allowed not to multiplex in the same PDU with STCH (SLData) or other SL DRX Command MAC CE.

As another embodiment, when the Tx UE transmits the last PDU of the sameTB (or the last PDU for all SL data), the Tx UE is allowed to multiplexthe SL DRX Command MAC CE with STCH (SL Data) as an exception.

According to an embodiment of the present disclosure, for example, ifPUCCH resources for SR transmission of SL DRX Command MAC CE and SL CSIreporting MAC CE are overlapped, the SR for the MAC CE with the higherpriority order is transmitted, compared to the priority orders of thetwo MAC CEs.

According to an embodiment of the present disclosure, for example, eachsidelink logical channel may be mapped to zero or one SR configuration,which is configured by RRC. If the SL-DRX Command MAC CE transmissionprocedure is enabled by RRC, the SL-DRX Command MAC CE reporting ismapped to one SR configuration per PC5-RRC connections (or per SLunicast link or per pair of L2 SRC/DST ID per direction or per directionper pair of L2 SRC/DST ID). The SR configuration of the SL-DRX CommandMAC CE reporting triggered according to SL DRX Command MAC CE procedureis considered as corresponding SR configuration for the triggered SR (SRfor UL-SCH). The value of the priority of the triggered SR correspondsto the value of the priority of the Sidelink DRX Command MAC CE.

According to an embodiment of the present disclosure, for example, whenthe SL DRX Command MAC CE transmission is triggered or transmitted,other resources excluding the resources selected within the CurrentActive Time of the Rx UE operating DRX among the reserved resources (forexample, the reserved resources selected within the Future Active Timeof the Rx UE) is cancelled all. That is, only SL Data transmission usingthe selected resource within the Current Active Time is completed, andall SL Data transmission through the remaining reserved resources iscancelled. The Rx UE may stop the SL DRX timer (e.g., SL DRX ondurationtimer, SL DRX Inactivity Timer, SL DRX Retransmission Timer) aftersuccessfully completing the ongoing SL Data reception at the currentactive time and may transit to sleep mode. can do. Alternatively, the RxUE may stop the SL DRX timer (e.g., SL DRX onduration timer, SL DRXInactivity Timer, SL DRX Retransmission Timer) when the currentlyrunning SL DRX timer expires and transition to sleep mode.

According to an embodiment of the present disclosure, for example,Current Active Time may be an Active Time by SL DRX Timer (e.g., SL DRXOnduration Timer, SL DRX Inactivity Timer, SL DRX Retransmission Timer)that the RX UE is currently operating

According to an embodiment of the present disclosure, for example,Future Active Time may be an Active Time by SL DRX Timer (e.g., SL DRXOnduration Timer, SL DRX Inactivity Timer, SL DRX Retransmission Timer)in which the Rx UE will receive PSCCH/PSSCH by the resources reserved bythe Tx UE (resources for which transmission has not yet occurred) andthat the Rx UE will operate in the future)

The operation according to an embodiment of the present disclosure (forexample, above-described operation according to an embodiment of thepresent disclosure) can be applied only to per PC5-RRC connection (orper SL unicast link or per pair of L2 SRC/DST ID per direction or perdirection per pair of L2 SRC/DST ID). Alternatively, it may be appliedlimitedly to per all PC5-RRC connection (or per all SL Unicast link orall pair of L2 Source/Destination ID).

According to an embodiment of the present disclosure, for example, a UEmay not define a dedicated Scheduling Request (SR) configuration forreceiving a grant for transmission of SL DRX Command MAC CE, and the UEmay reuse SL channel state information (CSI) SR configuration forReporting MAC CE. For example, in order to be allocated a grant for SLDRX Command MAC CE transmission, the UE may transmit the SR to the basestation by applying the SR configuration for SL channel stateinformation (CSI) Reporting MAC CE. For example, when the base stationreceives a scheduling request to which the SR Configuration for SL CSIReporting MAC CE is applied from the UE, the base station can allocate agrant for transmission of the SL CSI Reporting MAC CE or SL DRX CommandMAC CE to the UE.

FIG. 11 is a figure for explaining a method of operating an SL DRX timerin a groupcast NACK only mode according to an embodiment of the presentdisclosure. The embodiment of FIG. 11 may be combined with variousembodiments of the present disclosure.

Referring to FIG. 11 , according to an embodiment of the presentdisclosure, for example, The TX UE may obtain a scheduling request (SR)configuration for SL CSI reporting MAC CE. For example, the TX UE mayreceive an SR configuration (eg, an RRC message including SRconfiguration (e.g., RRC setup message, RRC resume message, RRC suspendmessage)) for SL CSI reporting MAC CE from the base station. Forexample, the TX UE may establish an RRC connection with the base station(e.g., an RRC connection may be established based on an RRC messageincluding SR configuration).

For example, the base station, TX UE, and/or RX UE may obtain SL DRXconfiguration including information related to a timer for active time(e.g., SL DRX on-duration timer, SL DRX inactivity timer). For example,the base station may transmit information related to SL DRXconfiguration to the TX UE. For example, the TX UE may transmitinformation related to SL DRX configuration to the RX UE. For example,SL DRX configuration(s) may be pre-configured for the TX UE and/or theRX UE.

For example, the RX UE may start a timer for active time. For example,the RX UE may perform an SL DRX operation based on the timer for theactive time.

For example, the TX UE may trigger a procedure related to the SL DRXcommand MAC CE. For example, the TX UE may trigger an SL DRX commandindication.

For example, a TX UE may trigger SR.

For example, the TX UE may determine (e.g., consider) the SRconfiguration for the SL CSI reporting MAC CE as the SR configurationfor the SL DRX command MAC CE.

For example, the TX UE may transmit an SR for requesting resources tothe base station (e.g., based on the SR configuration for the SL CSIreporting MAC CE determined as the SR configuration for the SL DRXcommand MAC CE). For example, a TX UE may receive resource-relatedinformation from a base station (e.g., based on sidelink resourceallocation mode 1).

For example, the TX UE may transmit an SL DRX command MAC CE to the RXUE based on the resource. For example, after the RX UE receives the SLDRX command MAC CE, the RX UE may stop a timer (e.g., SL DRX on-durationtimer, SL DRX inactivity timer) for an active time being driven. Forexample, after the RX UE receives the SL DRX command MAC CE, the RX UEmay stop monitoring the PSCCH/PSSCH.

Therefore, for example, according to an embodiment of the presentdisclosure, by blocking the overlapping procedure for allocatingresources for MAC CE based on SR in CSI reporting and DRX command MACCE, Signaling overhead between the TX UE and the base station to beallocated resources for SL DRX command MAC CE can be reduced. Forexample, according to an embodiment of the present disclosure, byblocking a procedure for allocating resources for MAC CE based on SRfrom being duplicated in CSI reporting and DRX command MAC CE, SL DRXcommand MAC CE transmission delay can be reduced. In particular, forexample, when the TX UE and/or the RX UE perform the SL DRX operation,the transmission delay of the SL DRX command MAC CE is reduced, so thatthe power of the TX UE and/or the power of the RX UE may not be wasted.

An embodiment of the present disclosure may have various effects. Forexample, according to an embodiment of the present disclosure,transmission resources for DRX command MAC CE may be allocated based ononly fixed-size SL CSI reporting-based SR configuration, without SRconfiguration for allocation transmission grant for a DRX command MACCE. For example, according to an embodiment of the present disclosure,without a procedure necessarily involved in the nature of the variablesize of the SR configuration for receiving a transmission grant (e.g.,the TX UE reports the buffer size to the base station, and a sidelinkgrant can be allocated to the TX UE from the base station), transmissionresource(s) for DRX command MAC CE may be allocated. For example,according to an embodiment of the present disclosure, transmission delaycan be reduced by omitting separate SR configuration signalling and aseparate SR/BSR procedure. For example, according to an embodiment ofthe present disclosure, signalling overhead can be reduced by omittingseparate SR configuration signalling and separate SR/BSR procedures.

The proposal of the present disclosure can be applied and extended to amethod for solving a problem in which loss occurs due to an interruptionoccurring during Uu BWP switching.

In addition, the proposal of the present disclosure can be applied andextended to a method to solve the problem of loss due to interruptionoccurring during SL BWP switching when (e.g., a plurality of) SL BWPsare supported for the UE.

The proposal of the present disclosure may be extended and applied toparameters (e.g., timers) included in UE-pair specific SL DRXconfiguration, UE-pair specific SL DRX pattern, or UE-pair specific SLDRX configuration, in addition to parameters (e.g. timers) included indefault/common SL DRX configuration, default/common SL DRX patterns, ordefault/common SL DRX configuration.

In addition, an on-duration mentioned in the proposal of the presentdisclosure can be extended and interpreted as an active time period(e.g., time to wake-up state (e.g., RF module turned on) toreceive/transmit radio signals), an off-duration may be extended andinterpreted as a sleep time (e.g., a time for operating in a sleep modestate (e.g., a state in which an RF module is turned off) for powersaving). It does not mean that a TX UE is obligated to operate in asleep mode in a sleep time interval. If necessary, a TX UE may beallowed to operate in an active time for a while for a sensing operationand/or a transmission operation even in sleep time.

For example, whether the (part of) proposed method/rule of the presentdisclosure is applied and/or a related parameter (e.g., threshold) maybe configured specifically (or differently or independently) for aresource pool. For example, whether the (part of) proposed method/ruleof the present disclosure is applied and/or a related parameter (e.g.,threshold) may be configured specifically (or differently orindependently) for congestion level. For example, whether the (part of)proposed method/rule of the present disclosure is applied and/or arelated parameter (e.g., threshold) may be configured specifically (ordifferently or independently) for a priority of a service. For example,whether the (part of) proposed method/rule of the present disclosure isapplied and/or a related parameter (e.g., threshold) may be configuredspecifically (or differently or independently) for a service type. Forexample, whether the (part of) proposed method/rule of the presentdisclosure is applied and/or a related parameter (e.g., threshold) maybe configured specifically (or differently or independently) for a QoSrequirement (e.g., latency, reliability). For example, whether the (partof) proposed method/rule of the present disclosure is applied and/or arelated parameter (e.g., threshold) may be configured specifically (ordifferently or independently) for PQI(5QI(5G QoS identifier) for PC5).For example, whether the (part of) proposed method/rule of the presentdisclosure is applied and/or a related parameter (e.g., threshold) maybe configured specifically (or differently or independently) for atraffic type (e.g., a periodic generation or a aperiodic generation).For example, whether the (part of) proposed method/rule of the presentdisclosure is applied and/or a related parameter (e.g., threshold) maybe configured specifically (or differently or independently) for an SLtransmission resource allocation mode (e.g., mode 1 or mode 2).

For example, whether the proposed rule of the present disclosure isapplied and/or related parameter setting values may be configuredspecifically (or differently or independently) for a resource pool. Forexample, whether the proposed rule of the present disclosure is appliedand/or related parameter setting values may be configured specifically(or differently or independently) for a type of service/packet. Forexample, whether the proposed rule of the present disclosure is appliedand/or related parameter setting values may be configured specifically(or differently or independently) for a priority of service/packet. Forexample, whether the proposed rule of the present disclosure is appliedand/or related parameter setting values may be configured specifically(or differently or independently) for QoS requirements (e.g., URLLC/EMBBtraffic, reliability, latency). For example, whether the proposed ruleof the present disclosure is applied and/or related parameter settingvalues may be configured specifically (or differently or independently)for PQI. For example, whether the proposed rule of the presentdisclosure is applied and/or related parameter setting values may beconfigured specifically (or differently or independently) for a casttype (e.g., unicast, groupcast, broadcast). For example, whether theproposed rule of the present disclosure is applied and/or relatedparameter setting values may be configured specifically (or differentlyor independently) for (resource pool) congestion level (e.g., CBR). Forexample, whether the proposed rule of the present disclosure is appliedand/or related parameter setting values may be configured specifically(or differently or independently) for SL HARQ feedback scheme (e.g.,NACK-only feedback, ACK/NACK feedback). For example, whether theproposed rule of the present disclosure is applied and/or relatedparameter setting values may be configured specifically (or differentlyor independently) for HARQ Feedback Enabled MAC PDU transmission. Forexample, whether the proposed rule of the present disclosure is appliedand/or related parameter setting values may be configured specifically(or differently or independently) for HARQ Feedback Disabled MAC PDUtransmission. For example, whether the proposed rule of the presentdisclosure is applied and/or related parameter setting values may beconfigured specifically (or differently or independently) for whetherPUCCH-based SL HARQ feedback reporting operation is set. For example,whether the proposed rule of the present disclosure is applied and/orrelated parameter setting values may be configured specifically (ordifferently or independently) for a resource reselection based onpre-emption or pre-emption. For example, whether the proposed rule ofthe present disclosure is applied and/or related parameter settingvalues may be configured specifically (or differently or independently)for a re-evaluation or re-selection of resources based on re-evaluation.

For example, whether the proposed rule of the present disclosure isapplied and/or related parameter setting values may be configuredspecifically (or differently or independently) for (L2 or L1) (sourceand/or destination) identifier. For example, whether the proposed ruleof the present disclosure is applied and/or related parameter settingvalues may be configured specifically (or differently or independently)for (L2 or L1) (Combination of Source ID and Destination ID) Identifier.For example, whether the proposed rule of the present disclosure isapplied and/or related parameter setting values may be configuredspecifically (or differently or independently) for (L2 or L1) (acombination of source ID and destination ID pair and cast type)identifier. For example, whether the proposed rule of the presentdisclosure is applied and/or related parameter setting values may beconfigured specifically (or differently or independently) for thedirection of a pair of source layer ID and destination layer ID. Forexample, whether the proposed rule of the present disclosure is appliedand/or related parameter setting values may be configured specifically(or differently or independently) for PC5 RRC connection/link. Forexample, whether the proposed rule of the present disclosure is appliedand/or related parameter setting values may be configured specifically(or differently or independently) for the case of performing SL DRX. Forexample, whether the proposed rule of the present disclosure is appliedand/or related parameter setting values may be configured specifically(or differently or independently) for SL mode type (e.g., resourceallocation mode 1 or resource allocation mode 2). For example, whetherthe proposed rule of the present disclosure is applied and/or relatedparameter setting values may be configured specifically (or differentlyor independently) for a case of performing (a) periodic resourcereservation.

The certain time referred to in the proposal of the present disclosuremay refer to a time during which a UE operates as an active time for apredefined time in order to receive a sidelink signal or sidelink datafrom a counterpart UE. A certain time referred to in the proposal of thepresent disclosure may refer to a time during which a UE operates as anactive time for a specific timer (e.g., a sidelink DRX retransmissiontimer, a sidelink DRX inactivity timer, or a timer that guaranteesoperation as active time in DRX operation of an RX UE) time in order toreceive a sidelink signal or sidelink data from a counterpart UE. Inaddition, whether the proposal and proposal rule of the presentdisclosure are applied (and/or related parameter setting values) mayalso be applied to mmWave SL operation.

FIG. 12 shows a method for a first device to perform wirelesscommunication, according to an embodiment of the present disclosure. Theembodiment of FIG. 12 may be combined with various embodiments of thepresent disclosure.

Referring to FIG. 12 , in step S1210, for example, the first device mayobtain a sidelink (SL) discontinuous reception (DRX) configurationincluding information related to an SL DRX timer. For example, the SLDRX timer may include at least one of an SL DRX onduration timer or anSL DRX inactivity timer. For example, in step S1220, the first devicemay obtain information related to a scheduling request (SR)configuration for a SL channel state information (CSI) reporting mediumaccess control (MAC) control element (CE). For example, in step S1230,the first device may determine the SR configuration for the SL CSIreporting MAC CE as an SR configuration for an SL DRX command MAC CE.For example, in step S1240, the first device may transmit, to the basestation, an SR for requesting a resource for the SL DRX command MAC CE,based on the SR configuration for the SL CSI reporting MAC CE. Forexample, in step S1250, the first device may transmit, to the seconddevice, the SL DRX command MAC CE, based on the resource. For example,the SL DRX command MAC CE may be information for stopping at least oneof the SL DRX onduration timer or the SL DRX inactivity timer.

Additionally or alternatively, the first device may receive, from thesecond device, first sidelink control information (SCI) for schedulingof a physical sidelink shared channel (PSSCH) and second SCI through aphysical sidelink control channel (PSCCH).

Additionally or alternatively, the first device may, based on theresource related to the PSSCH, receive, from the second device, thesecond SCI and CSI reference signal (RS) including information relatedto an SL CSI request.

Additionally or alternatively, the first device may, trigger SL CSIreporting, based on the second SCI.

Additionally or alternatively, the first device may, based on thetriggering the SL CSI reporting, generate the SL CSI reporting MAC CE.

Additionally or alternatively, reporting related to the SL DRX commandMAC CE may be mapped with the SR configuration for the SL CSI reportingMAC CE.

Additionally or alternatively, the first device may, trigger a procedurerelated to the SL DRX command MAC CE.

Additionally or alternatively, based on the triggering the procedurerelated to the SL DRX command MAC CE and the resource, the SL DRXcommand MAC CE may be transmitted to the second device.

Additionally or alternatively, the first device may, receive informationrelated to uplink (UL) resources from the base station.

Additionally or alternatively, the UL resource includes a physicaluplink control channel (PUCCH) resource.

Additionally or alternatively, the SR may be transmitted to the basestation through PUCCH based on the PUCCH resource

Additionally or alternatively, the PUCCH resource may be configured foreach UL bandwidth part (BWP) for a procedure related to the SL DRXcommand MAC CE.

Additionally or alternatively, the first device may, based on the SR,receive, from the base station, information related to the resource forthe SL DRX command MAC CE.

Additionally or alternatively, the SL DRX configuration may includeinformation related to an active time of the second device

Additionally or alternatively, at least one of a time when the SL DRXon-duration timer is running or a time when the SL DRX inactivity timeris running may be included in the active time of the second device.

Additionally or alternatively, the SL DRX command MAC CE may include ahybrid automatic repeat request (HARQ) feedback enabled SL DRX commandMAC CE.

Additionally or alternatively, the first device may, receive HARQfeedback information related to the SL DRX command MAC CE.

Additionally or alternatively, the first device may, based on the HARQfeedback information being received, transmit positive-ACK informationto the base station.

Additionally or alternatively, the first device may, cancel an SL bufferstate report (BSR) procedure, based on the SL DRX command MAC CE beingtransmitted.

Additionally or alternatively, based on the priority of the SL DRXcommand MAC CE being higher than the priority of the SL CSI reportingMAC CE, the SR for requesting the resource for the SL DRX command MAC CEmay be transmitted to the base station, and SR for requesting resourcesfor the SL CSI reporting MAC CE may not be transmitted.

The proposed method may be applied to an apparatus according to variousembodiments of the present disclosure. First, a processor 102 of a firstapparatus 100 may execute the instructions to: obtain a sidelink (SL)discontinuous reception (DRX) configuration including informationrelated to an SL DRX timer. For example, the SL DRX timer may include atleast one of an SL DRX onduration timer or an SL DRX inactivity timer.For example, a processor 102 of a first apparatus 100 may execute theinstructions to: obtain information related to a scheduling request (SR)configuration for a SL channel state information (CSI) reporting mediumaccess control (MAC) control element (CE). For example, a processor 102of a first apparatus 100 may execute the instructions to: determine theSR configuration for the SL CSI reporting MAC CE as an SR configurationfor an SL DRX command MAC CE. For example, a processor 102 of a firstapparatus 100 may execute the instructions to: control a transceiver 106to transmit, to the base station, an SR for requesting a resource forthe SL DRX command MAC CE, based on the SR configuration for the SL CSIreporting MAC CE. For example, a processor 102 of a first apparatus 100may execute the instructions to: control a transceiver 106 to transmit,to the second device, the SL DRX command MAC CE, based on the resource.For example, the SL DRX command MAC CE may be information for stoppingat least one of the SL DRX onduration timer or the SL DRX inactivitytimer.

According to an embodiment of the present disclosure, a first device forperforming wireless communication may be proposed. For example, thefirst device may include one or more memories storing instructions; oneor more transceivers; and one or more processors operably connected tothe one or more memories and the one or more transceivers, and the oneor more processors may execute the instructions to: obtain a sidelink(SL) discontinuous reception (DRX) configuration including informationrelated to an SL DRX timer. For example, the SL DRX timer may include atleast one of an SL DRX onduration timer or an SL DRX inactivity timer.For example, the one or more processors may execute the instructions to:obtain information related to a scheduling request (SR) configurationfor a SL channel state information (CSI) reporting medium access control(MAC) control element (CE). For example, the one or more processors mayexecute the instructions to: determine the SR configuration for the SLCSI reporting MAC CE as an SR configuration for an SL DRX command MACCE. For example, the one or more processors may execute the instructionsto: transmit, to the base station, an SR for requesting a resource forthe SL DRX command MAC CE, based on the SR configuration for the SL CSIreporting MAC CE. For example, the one or more processors may executethe instructions to: transmit, to the second device, the SL DRX commandMAC CE, based on the resource. For example, the SL DRX command MAC CEmay be information for stopping at least one of the SL DRX ondurationtimer or the SL DRX inactivity timer.

According to an embodiment of the present disclosure, an deviceconfigured to control a first UE may be proposed. For example, thedevice may comprise: one or more processors; and one or more memoriesoperably connected to the one or more processors and storinginstructions, and the one or more processors may execute theinstructions to: obtain a sidelink (SL) discontinuous reception (DRX)configuration including information related to an SL DRX timer. Forexample, the SL DRX timer may include at least one of an SL DRXonduration timer or an SL DRX inactivity timer. For example, the one ormore processors may execute the instructions to: obtain informationrelated to a scheduling request (SR) configuration for a SL channelstate information (CSI) reporting medium access control (MAC) controlelement (CE). For example, the one or more processors may execute theinstructions to: determine the SR configuration for the SL CSI reportingMAC CE as an SR configuration for an SL DRX command MAC CE. For example,the one or more processors may execute the instructions to: transmit, tothe base station, an SR for requesting a resource for the SL DRX commandMAC CE, based on the SR configuration for the SL CSI reporting MAC CE.For example, the one or more processors may execute the instructions to:transmit, to the second UE, the SL DRX command MAC CE, based on theresource. For example, the SL DRX command MAC CE may be information forstopping at least one of the SL DRX onduration timer or the SL DRXinactivity timer.

According to an embodiment of the present disclosure, non-transitorycomputer-readable storage medium storing instructions may be proposed.For example, the instructions, when executed, may cause a first deviceto: obtain a sidelink (SL) discontinuous reception (DRX) configurationincluding information related to an SL DRX timer. For example, the SLDRX timer may include at least one of an SL DRX onduration timer or anSL DRX inactivity timer. For example, the instructions, when executed,may cause a first device to: obtain information related to a schedulingrequest (SR) configuration for a SL channel state information (CSI)reporting medium access control (MAC) control element (CE). For example,the instructions, when executed, may cause a first device to: determinethe SR configuration for the SL CSI reporting MAC CE as an SRconfiguration for an SL DRX command MAC CE. For example, theinstructions, when executed, may cause a first device to: transmit, tothe base station, an SR for requesting a resource for the SL DRX commandMAC CE, based on the SR configuration for the SL CSI reporting MAC CE.For example, the instructions, when executed, may cause a first deviceto: transmit, to the second device, the SL DRX command MAC CE, based onthe resource. For example, the SL DRX command MAC CE may be informationfor stopping at least one of the SL DRX onduration timer or the SL DRXinactivity timer.

FIG. 13 shows a method for a base station to perform wirelesscommunication according to an embodiment of the present disclosure. Theembodiment of FIG. 13 may be combined with various embodiments of thepresent disclosure.

Referring to FIG. 13 , in step S1310, for example, the base station mayobtain a sidelink (SL) discontinuous reception (DRX) configurationincluding information related to an SL DRX timer. For example, the SLDRX timer may include at least one of an SL DRX onduration timer or anSL DRX inactivity timer. For example, in step S1320, the base stationmay obtain information related to a scheduling request (SR)configuration for a SL channel state information (CSI) reporting mediumaccess control (MAC) control element (CE). For example, the SRconfiguration may be determined for the SL CSI reporting MAC CE as an SRconfiguration for an SL DRX command MAC CE. For example, in step S1330,the base station may receive, from the first device, an SR forrequesting a resource for the SL DRX command MAC CE, based on the SRconfiguration for the SL CSI reporting MAC CE. For example, the SL DRXcommand MAC CE may be transmitted, to the second device, based on theresource. For example, the SL DRX command MAC CE may be information forstopping at least one of the SL DRX onduration timer or the SL DRXinactivity timer.

Additionally or alternatively, first sidelink control information (SCI)for scheduling of a physical sidelink shared channel (PSSCH) and secondSCI through a physical sidelink control channel (PSCCH) may be received,from the second device.

Additionally or alternatively, based on the resource related to thePSSCH, second SCI and CSI reference signal (RS) including informationrelated to an SL CSI request may be received from the second device.

Additionally or alternatively, SL CSI reporting, based on the secondSCI, may be triggered.

Additionally or alternatively, based on the triggering the SL CSIreporting, the SL CSI reporting MAC CE may be generated.

Additionally or alternatively, reporting related to the SL DRX commandMAC CE is mapped with the SR configuration for the SL CSI reporting MACCE.

Additionally or alternatively, a procedure related to the SL DRX commandMAC CE may be triggered.

Additionally or alternatively, based on the triggering the procedurerelated to the SL DRX command MAC CE and the resource, the SL DRXcommand MAC CE may be transmitted to the second device.

Additionally or alternatively, the base station may, transmitinformation related to uplink (UL) resources to the first device.

Additionally or alternatively, the UL resource includes a physicaluplink control channel (PUCCH) resource.

Additionally or alternatively, the SR may be received from the firstdevice through PUCCH based on the PUCCH resource

Additionally or alternatively, the PUCCH resource may be configured foreach UL bandwidth part (BWP) for a procedure related to the SL DRXcommand MAC CE.

Additionally or alternatively, the base station may, based on the SR,receive, to the first device, information related to the resource forthe SL DRX command MAC CE.

Additionally or alternatively, the SL DRX configuration may includeinformation related to an active time of the second device

Additionally or alternatively, at least one of a time when the SL DRXon-duration timer is running or a time when the SL DRX inactivity timeris running may be included in the active time of the second device.

Additionally or alternatively, the SL DRX command MAC CE may include ahybrid automatic repeat request (HARQ) feedback enabled SL DRX commandMAC CE.

Additionally or alternatively, HARQ feedback information related to theSL DRX command MAC CE may be received.

Additionally or alternatively, the base station may, based on the HARQfeedback information being received, receive positive-ACK informationfrom the first device.

Additionally or alternatively, an SL buffer state report (BSR)procedure, based on the SL DRX command MAC CE being transmitted, may becancelled.

Additionally or alternatively, based on the priority of the SL DRXcommand MAC CE being higher than the priority of the SL CSI reportingMAC CE, the SR for requesting the resource for the SL DRX command MAC CEmay be received from the first device, and SR for requesting resourcesfor the SL CSI reporting MAC CE may not be received.

The proposed method may be applied to a device according to variousembodiments of the present disclosure. First, a processor 202 of a basestation 200 may execute the instructions to: obtain a sidelink (SL)discontinuous reception (DRX) configuration including informationrelated to an SL DRX timer. For example, the SL DRX timer may include atleast one of an SL DRX onduration timer or an SL DRX inactivity timer.For example, a processor 202 of a base station 200 may execute theinstructions to: obtain information related to a scheduling request (SR)configuration for a SL channel state information (CSI) reporting mediumaccess control (MAC) control element (CE). For example, the SRconfiguration may be determined for the SL CSI reporting MAC CE as an SRconfiguration for an SL DRX command MAC CE. For example, a processor 202of a base station 200 may execute the instructions to: control atransceiver 206 to receive, from a first device, an SR for requesting aresource for the SL DRX command MAC CE, based on the SR configurationfor the SL CSI reporting MAC CE. For example, the SL DRX command MAC CEmay be transmitted, to a second device, based on the resource. Forexample, the SL DRX command MAC CE may be information for stopping atleast one of the SL DRX onduration timer or the SL DRX inactivity timer.

According to an embodiment of the present disclosure, a base station forperforming wireless communication may be proposed. For example, the basestation may include one or more memories storing instructions; one ormore transceivers; and one or more processors operably connected to theone or more memories and the one or more transceivers, and the one ormore processors may execute the instructions to: obtain a sidelink (SL)discontinuous reception (DRX) configuration including informationrelated to an SL DRX timer. For example, the SL DRX timer may include atleast one of an SL DRX onduration timer or an SL DRX inactivity timer.For example, the one or more processors may execute the instructions to:obtain information related to a scheduling request (SR) configurationfor a SL channel state information (CSI) reporting medium access control(MAC) control element (CE). For example, the SR configuration may bedetermined for the SL CSI reporting MAC CE as an SR configuration for anSL DRX command MAC CE. For example, the one or more processors mayexecute the instructions to: receive, from a first device, an SR forrequesting a resource for the SL DRX command MAC CE, based on the SRconfiguration for the SL CSI reporting MAC CE. For example, the SL DRXcommand MAC CE may be transmitted, to a second device, based on theresource. For example, the SL DRX command MAC CE may be information forstopping at least one of the SL DRX onduration timer or the SL DRXinactivity timer.

According to an embodiment of the present disclosure, an apparatusconfigured to control a base station may be proposed. For example, theapparatus may comprise: one or more processors; and one or more memoriesoperably connected to the one or more processors and storinginstructions, and the one or more processors may execute theinstructions to: obtain a sidelink (SL) discontinuous reception (DRX)configuration including information related to an SL DRX timer. Forexample, the SL DRX timer may include at least one of an SL DRXonduration timer or an SL DRX inactivity timer. For example, the one ormore processors may execute the instructions to: obtain informationrelated to a scheduling request (SR) configuration for a SL channelstate information (CSI) reporting medium access control (MAC) controlelement (CE). For example, the SR configuration may be determined forthe SL CSI reporting MAC CE as an SR configuration for an SL DRX commandMAC CE. For example, the one or more processors may execute theinstructions to: receive, from a first UE, an SR for requesting aresource for the SL DRX command MAC CE, based on the SR configurationfor the SL CSI reporting MAC CE. For example, the SL DRX command MAC CEmay be transmitted, to the second UE, based on the resource. Forexample, the SL DRX command MAC CE may be information for stopping atleast one of the SL DRX onduration timer or the SL DRX inactivity timer.

According to an embodiment of the present disclosure, non-transitorycomputer-readable storage medium storing instructions may be proposed.For example, the instructions, when executed, may cause a second deviceto: obtain a sidelink (SL) discontinuous reception (DRX) configurationincluding information related to an SL DRX timer. For example, the SLDRX timer may include at least one of an SL DRX onduration timer or anSL DRX inactivity timer. For example, the instructions, when executed,may cause a second device to: obtain information related to a schedulingrequest (SR) configuration for a SL channel state information (CSI)reporting medium access control (MAC) control element (CE). For example,the SR configuration may be determined for the SL CSI reporting MAC CEas an SR configuration for an SL DRX command MAC CE. For example, theinstructions, when executed, may cause a second device to: receive, froma first UE, an SR for requesting a resource for the SL DRX command MACCE, based on the SR configuration for the SL CSI reporting MAC CE. Forexample, the SL DRX command MAC CE may be transmitted, to the second UE,based on the resource. For example, the SL DRX command MAC CE may beinformation for stopping at least one of the SL DRX onduration timer orthe SL DRX inactivity timer.

Various embodiments of the present disclosure may be combined with eachother.

Hereinafter, device(s) to which various embodiments of the presentdisclosure can be applied will be described.

The various descriptions, functions, procedures, proposals, methods,and/or operational flowcharts of the present disclosure described inthis document may be applied to, without being limited to, a variety offields requiring wireless communication/connection (e.g., 5G) betweendevices.

Hereinafter, a description will be given in more detail with referenceto the drawings. In the following drawings/description, the samereference symbols may denote the same or corresponding hardware blocks,software blocks, or functional blocks unless described otherwise.

FIG. 14 shows a communication system 1, based on an embodiment of thepresent disclosure. The embodiment of FIG. 14 may be combined withvarious embodiments of the present disclosure.

Referring to FIG. 14 , a communication system 1 to which variousembodiments of the present disclosure are applied includes wirelessdevices, Base Stations (BSs), and a network. Herein, the wirelessdevices represent devices performing communication using Radio AccessTechnology (RAT) (e.g., 5G New RAT (NR)) or Long-Term Evolution (LTE))and may be referred to as communication/radio/5G devices. The wirelessdevices may include, without being limited to, a robot 100 a, vehicles100 b-1 and 100 b-2, an eXtended Reality (XR) device 100 c, a hand-helddevice 100 d, a home appliance 100 e, an Internet of Things (IoT) device100 f, and an Artificial Intelligence (AI) device/server 400. Forexample, the vehicles may include a vehicle having a wirelesscommunication function, an autonomous vehicle, and a vehicle capable ofperforming communication between vehicles. Herein, the vehicles mayinclude an Unmanned Aerial Vehicle (UAV) (e.g., a drone). The XR devicemay include an Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality(MR) device and may be implemented in the form of a Head-Mounted Device(HMD), a Head-Up Display (HUD) mounted in a vehicle, a television, asmartphone, a computer, a wearable device, a home appliance device, adigital signage, a vehicle, a robot, etc. The hand-held device mayinclude a smartphone, a smartpad, a wearable device (e.g., a smartwatchor a smartglasses), and a computer (e.g., a notebook). The homeappliance may include a TV, a refrigerator, and a washing machine. TheIoT device may include a sensor and a smartmeter. For example, the BSsand the network may be implemented as wireless devices and a specificwireless device 200 a may operate as a BS/network node with respect toother wireless devices.

Here, wireless communication technology implemented in wireless devices100 a to 100 f of the present disclosure may include Narrowband Internetof Things for low-power communication in addition to LTE, NR, and 6G. Inthis case, for example, NB-IoT technology may be an example of Low PowerWide Area Network (LPWAN) technology and may be implemented as standardssuch as LTE Cat NB1, and/or LTE Cat NB2, and is not limited to the namedescribed above. Additionally or alternatively, the wirelesscommunication technology implemented in the wireless devices 100 a to100 f of the present disclosure may perform communication based on LTE-Mtechnology. In this case, as an example, the LTE-M technology may be anexample of the LPWAN and may be called by various names includingenhanced Machine Type Communication (eMTC), and the like. For example,the LTE-M technology may be implemented as at least any one of variousstandards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTEnon-Bandwidth Limited (non-BL), 5) LTE-MTC, 6) LTE Machine TypeCommunication, and/or 7) LTE M, and is not limited to the name describedabove. Additionally or alternatively, the wireless communicationtechnology implemented in the wireless devices 100 a to 100 f of thepresent disclosure may include at least one of Bluetooth, Low Power WideArea Network (LPWAN), and ZigBee considering the low-powercommunication, and is not limited to the name described above. As anexample, the ZigBee technology may generate personal area networks (PAN)related to small/low-power digital communication based on variousstandards including IEEE 802.15.4, and the like, and may be called byvarious names.

The wireless devices 100 a to 100 f may be connected to the network 300via the BSs 200. An AI technology may be applied to the wireless devices100 a to 100 f and the wireless devices 100 a to 100 f may be connectedto the AI server 400 via the network 300. The network 300 may beconfigured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g.,NR) network. Although the wireless devices 100 a to 100 f maycommunicate with each other through the BSs 200/network 300, thewireless devices 100 a to 100 f may perform direct communication (e.g.,sidelink communication) with each other without passing through theBSs/network. For example, the vehicles 100 b-1 and 100 b-2 may performdirect communication (e.g. Vehicle-to-Vehicle(V2V)/Vehicle-to-everything (V2X) communication). The IoT device (e.g.,a sensor) may perform direct communication with other IoT devices (e.g.,sensors) or other wireless devices 100 a to 100 f.

Wireless communication/connections 150 a, 150 b, or 150 c may beestablished between the wireless devices 100 a to 100 f/BS 200, or BS200/BS 200. Herein, the wireless communication/connections may beestablished through various RATs (e.g., 5G NR) such as uplink/downlinkcommunication 150 a, sidelink communication 150 b (or, D2Dcommunication), or inter BS communication (e.g. relay, Integrated AccessBackhaul (IAB)). The wireless devices and the BSs/the wireless devicesmay transmit/receive radio signals to/from each other through thewireless communication/connections 150 a and 150 b. For example, thewireless communication/connections 150 a and 150 b may transmit/receivesignals through various physical channels. To this end, at least a partof various configuration information configuring processes, varioussignal processing processes (e.g., channel encoding/decoding,modulation/demodulation, and resource mapping/demapping), and resourceallocating processes, for transmitting/receiving radio signals, may beperformed based on the various proposals of the present disclosure.

FIG. 15 shows wireless devices, based on an embodiment of the presentdisclosure. The embodiment of FIG. 15 may be combined with variousembodiments of the present disclosure.

Referring to FIG. 15 , a first wireless device 100 and a second wirelessdevice 200 may transmit radio signals through a variety of RATs (e.g.,LTE and NR). Herein, {the first wireless device 100 and the secondwireless device 200} may correspond to {the wireless device 100 x andthe BS 200} and/or {the wireless device 100 x and the wireless device100 x} of FIG. 14 .

The first wireless device 100 may include one or more processors 102 andone or more memories 104 and additionally further include one or moretransceivers 106 and/or one or more antennas 108. The processor(s) 102may control the memory(s) 104 and/or the transceiver(s) 106 and may beconfigured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 102 may process informationwithin the memory(s) 104 to generate first information/signals and thentransmit radio signals including the first information/signals throughthe transceiver(s) 106. The processor(s) 102 may receive radio signalsincluding second information/signals through the transceiver 106 andthen store information obtained by processing the secondinformation/signals in the memory(s) 104. The memory(s) 104 may beconnected to the processor(s) 102 and may store a variety of informationrelated to operations of the processor(s) 102. For example, thememory(s) 104 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 102or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 102 and the memory(s) 104 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 106 may be connected to the processor(s) 102 andtransmit and/or receive radio signals through one or more antennas 108.Each of the transceiver(s) 106 may include a transmitter and/or areceiver. The transceiver(s) 106 may be interchangeably used with RadioFrequency (RF) unit(s). In the present disclosure, the wireless devicemay represent a communication modem/circuit/chip.

The second wireless device 200 may include one or more processors 202and one or more memories 204 and additionally further include one ormore transceivers 206 and/or one or more antennas 208. The processor(s)202 may control the memory(s) 204 and/or the transceiver(s) 206 and maybe configured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 202 may process informationwithin the memory(s) 204 to generate third information/signals and thentransmit radio signals including the third information/signals throughthe transceiver(s) 206. The processor(s) 202 may receive radio signalsincluding fourth information/signals through the transceiver(s) 106 andthen store information obtained by processing the fourthinformation/signals in the memory(s) 204. The memory(s) 204 may beconnected to the processor(s) 202 and may store a variety of informationrelated to operations of the processor(s) 202. For example, thememory(s) 204 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 202or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 202 and the memory(s) 204 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 206 may be connected to the processor(s) 202 andtransmit and/or receive radio signals through one or more antennas 208.Each of the transceiver(s) 206 may include a transmitter and/or areceiver. The transceiver(s) 206 may be interchangeably used with RFunit(s). In the present disclosure, the wireless device may represent acommunication modem/circuit/chip.

Hereinafter, hardware elements of the wireless devices 100 and 200 willbe described more specifically. One or more protocol layers may beimplemented by, without being limited to, one or more processors 102 and202. For example, the one or more processors 102 and 202 may implementone or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP,RRC, and SDAP). The one or more processors 102 and 202 may generate oneor more Protocol Data Units (PDUs) and/or one or more Service Data Unit(SDUs) according to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document. Theone or more processors 102 and 202 may generate messages, controlinformation, data, or information according to the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document. The one or more processors 102 and 202 maygenerate signals (e.g., baseband signals) including PDUs, SDUs,messages, control information, data, or information according to thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document and provide thegenerated signals to the one or more transceivers 106 and 206. The oneor more processors 102 and 202 may receive the signals (e.g., basebandsignals) from the one or more transceivers 106 and 206 and acquire thePDUs, SDUs, messages, control information, data, or informationaccording to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.

The one or more processors 102 and 202 may be referred to ascontrollers, microcontrollers, microprocessors, or microcomputers. Theone or more processors 102 and 202 may be implemented by hardware,firmware, software, or a combination thereof. As an example, one or moreApplication Specific Integrated Circuits (ASICs), one or more DigitalSignal Processors (DSPs), one or more Digital Signal Processing Devices(DSPDs), one or more Programmable Logic Devices (PLDs), or one or moreField Programmable Gate Arrays (FPGAs) may be included in the one ormore processors 102 and 202. The descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument may be implemented using firmware or software and the firmwareor software may be configured to include the modules, procedures, orfunctions. Firmware or software configured to perform the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be included in the one or more processors102 and 202 or stored in the one or more memories 104 and 204 so as tobe driven by the one or more processors 102 and 202. The descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be implemented using firmware or softwarein the form of code, commands, and/or a set of commands.

The one or more memories 104 and 204 may be connected to the one or moreprocessors 102 and 202 and store various types of data, signals,messages, information, programs, code, instructions, and/or commands.The one or more memories 104 and 204 may be configured by Read-OnlyMemories (ROMs), Random Access Memories (RAMs), Electrically ErasableProgrammable Read-Only Memories (EPROMs), flash memories, hard drives,registers, cash memories, computer-readable storage media, and/orcombinations thereof. The one or more memories 104 and 204 may belocated at the interior and/or exterior of the one or more processors102 and 202. The one or more memories 104 and 204 may be connected tothe one or more processors 102 and 202 through various technologies suchas wired or wireless connection.

The one or more transceivers 106 and 206 may transmit user data, controlinformation, and/or radio signals/channels, mentioned in the methodsand/or operational flowcharts of this document, to one or more otherdevices. The one or more transceivers 106 and 206 may receive user data,control information, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, from one or moreother devices. For example, the one or more transceivers 106 and 206 maybe connected to the one or more processors 102 and 202 and transmit andreceive radio signals. For example, the one or more processors 102 and202 may perform control so that the one or more transceivers 106 and 206may transmit user data, control information, or radio signals to one ormore other devices. The one or more processors 102 and 202 may performcontrol so that the one or more transceivers 106 and 206 may receiveuser data, control information, or radio signals from one or more otherdevices. The one or more transceivers 106 and 206 may be connected tothe one or more antennas 108 and 208 and the one or more transceivers106 and 206 may be configured to transmit and receive user data, controlinformation, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, through the one ormore antennas 108 and 208. In this document, the one or more antennasmay be a plurality of physical antennas or a plurality of logicalantennas (e.g., antenna ports). The one or more transceivers 106 and 206may convert received radio signals/channels etc. from RF band signalsinto baseband signals in order to process received user data, controlinformation, radio signals/channels, etc. using the one or moreprocessors 102 and 202. The one or more transceivers 106 and 206 mayconvert the user data, control information, radio signals/channels, etc.processed using the one or more processors 102 and 202 from the baseband signals into the RF band signals. To this end, the one or moretransceivers 106 and 206 may include (analog) oscillators and/orfilters.

FIG. 16 shows a signal process circuit for a transmission signal, basedon an embodiment of the present disclosure. The embodiment of FIG. 16may be combined with various embodiments of the present disclosure.

Referring to FIG. 16 , a signal processing circuit 1000 may includescramblers 1010, modulators 1020, a layer mapper 1030, a precoder 1040,resource mappers 1050, and signal generators 1060. An operation/functionof FIG. 16 may be performed, without being limited to, the processors102 and 202 and/or the transceivers 106 and 206 of FIG. 15 . Hardwareelements of FIG. 16 may be implemented by the processors 102 and 202and/or the transceivers 106 and 206 of FIG. 15 . For example, blocks1010 to 1060 may be implemented by the processors 102 and 202 of FIG. 15. Alternatively, the blocks 1010 to 1050 may be implemented by theprocessors 102 and 202 of FIG. 15 and the block 1060 may be implementedby the transceivers 106 and 206 of FIG. 15 .

Codewords may be converted into radio signals via the signal processingcircuit 1000 of FIG. 16 . Herein, the codewords are encoded bitsequences of information blocks. The information blocks may includetransport blocks (e.g., a UL-SCH transport block, a DL-SCH transportblock). The radio signals may be transmitted through various physicalchannels (e.g., a PUSCH and a PDSCH).

Specifically, the codewords may be converted into scrambled bitsequences by the scramblers 1010. Scramble sequences used for scramblingmay be generated based on an initialization value, and theinitialization value may include ID information of a wireless device.The scrambled bit sequences may be modulated to modulation symbolsequences by the modulators 1020. A modulation scheme may includepi/2-Binary Phase Shift Keying (pi/2-BPSK), m-Phase Shift Keying(m-PSK), and m-Quadrature Amplitude Modulation (m-QAM). Complexmodulation symbol sequences may be mapped to one or more transportlayers by the layer mapper 1030. Modulation symbols of each transportlayer may be mapped (precoded) to corresponding antenna port(s) by theprecoder 1040. Outputs z of the precoder 1040 may be obtained bymultiplying outputs y of the layer mapper 1030 by an N*M precodingmatrix W. Herein, N is the number of antenna ports and M is the numberof transport layers. The precoder 1040 may perform precoding afterperforming transform precoding (e.g., DFT) for complex modulationsymbols. Alternatively, the precoder 1040 may perform precoding withoutperforming transform precoding.

The resource mappers 1050 may map modulation symbols of each antennaport to time-frequency resources. The time-frequency resources mayinclude a plurality of symbols (e.g., a CP-OFDMA symbols and DFT-s-OFDMAsymbols) in the time domain and a plurality of subcarriers in thefrequency domain. The signal generators 1060 may generate radio signalsfrom the mapped modulation symbols and the generated radio signals maybe transmitted to other devices through each antenna. For this purpose,the signal generators 1060 may include Inverse Fast Fourier Transform(IFFT) modules, Cyclic Prefix (CP) inserters, Digital-to-AnalogConverters (DACs), and frequency up-converters.

Signal processing procedures for a signal received in the wirelessdevice may be configured in a reverse manner of the signal processingprocedures 1010 to 1060 of FIG. 16 . For example, the wireless devices(e.g., 100 and 200 of FIG. 15 ) may receive radio signals from theexterior through the antenna ports/transceivers. The received radiosignals may be converted into baseband signals through signal restorers.To this end, the signal restorers may include frequency downlinkconverters, Analog-to-Digital Converters (ADCs), CP remover, and FastFourier Transform (FFT) modules. Next, the baseband signals may berestored to codewords through a resource demapping procedure, apostcoding procedure, a demodulation processor, and a descramblingprocedure. The codewords may be restored to original information blocksthrough decoding. Therefore, a signal processing circuit (notillustrated) for a reception signal may include signal restorers,resource demappers, a postcoder, demodulators, descramblers, anddecoders.

FIG. 17 shows another example of a wireless device, based on anembodiment of the present disclosure. The wireless device may beimplemented in various forms according to a use-case/service (refer toFIG. 14 ). The embodiment of FIG. 17 may be combined with variousembodiments of the present disclosure.

Referring to FIG. 17 , wireless devices 100 and 200 may correspond tothe wireless devices 100 and 200 of FIG. 15 and may be configured byvarious elements, components, units/portions, and/or modules. Forexample, each of the wireless devices 100 and 200 may include acommunication unit 110, a control unit 120, a memory unit 130, andadditional components 140. The communication unit may include acommunication circuit 112 and transceiver(s) 114. For example, thecommunication circuit 112 may include the one or more processors 102 and202 and/or the one or more memories 104 and 204 of FIG. 15 . Forexample, the transceiver(s) 114 may include the one or more transceivers106 and 206 and/or the one or more antennas 108 and 208 of FIG. 15 . Thecontrol unit 120 is electrically connected to the communication unit110, the memory 130, and the additional components 140 and controlsoverall operation of the wireless devices. For example, the control unit120 may control an electric/mechanical operation of the wireless devicebased on programs/code/commands/information stored in the memory unit130. The control unit 120 may transmit the information stored in thememory unit 130 to the exterior (e.g., other communication devices) viathe communication unit 110 through a wireless/wired interface or store,in the memory unit 130, information received through the wireless/wiredinterface from the exterior (e.g., other communication devices) via thecommunication unit 110.

The additional components 140 may be variously configured according totypes of wireless devices. For example, the additional components 140may include at least one of a power unit/battery, input/output (I/O)unit, a driving unit, and a computing unit. The wireless device may beimplemented in the form of, without being limited to, the robot (100 aof FIG. 14 ), the vehicles (100 b-1 and 100 b-2 of FIG. 14 ), the XRdevice (100 c of FIG. 14 ), the hand-held device (100 d of FIG. 14 ),the home appliance (100 e of FIG. 14 ), the IoT device (100 f of FIG. 14), a digital broadcast terminal, a hologram device, a public safetydevice, an MTC device, a medicine device, a fintech device (or a financedevice), a security device, a climate/environment device, the AIserver/device (400 of FIG. 14 ), the BSs (200 of FIG. 14 ), a networknode, etc. The wireless device may be used in a mobile or fixed placeaccording to a use-example/service.

In FIG. 17 , the entirety of the various elements, components,units/portions, and/or modules in the wireless devices 100 and 200 maybe connected to each other through a wired interface or at least a partthereof may be wirelessly connected through the communication unit 110.For example, in each of the wireless devices 100 and 200, the controlunit 120 and the communication unit 110 may be connected by wire and thecontrol unit 120 and first units (e.g., 130 and 140) may be wirelesslyconnected through the communication unit 110. Each element, component,unit/portion, and/or module within the wireless devices 100 and 200 mayfurther include one or more elements. For example, the control unit 120may be configured by a set of one or more processors. As an example, thecontrol unit 120 may be configured by a set of a communication controlprocessor, an application processor, an Electronic Control Unit (ECU), agraphical processing unit, and a memory control processor. As anotherexample, the memory 130 may be configured by a Random Access Memory(RAM), a Dynamic RAM (DRAM), a Read Only Memory (ROM)), a flash memory,a volatile memory, a non-volatile memory, and/or a combination thereof.

Hereinafter, an example of implementing FIG. 17 will be described indetail with reference to the drawings.

FIG. 18 shows a hand-held device, based on an embodiment of the presentdisclosure. The hand-held device may include a smartphone, a smartpad, awearable device (e.g., a smartwatch or a smartglasses), or a portablecomputer (e.g., a notebook). The hand-held device may be referred to asa mobile station (MS), a user terminal (UT), a Mobile Subscriber Station(MSS), a Subscriber Station (SS), an Advanced Mobile Station (AMS), or aWireless Terminal (WT). The embodiment of FIG. 18 may be combined withvarious embodiments of the present disclosure.

Referring to FIG. 18 , a hand-held device 100 may include an antennaunit 108, a communication unit 110, a control unit 120, a memory unit130, a power supply unit 140 a, an interface unit 140 b, and an I/O unit140 c. The antenna unit 108 may be configured as a part of thecommunication unit 110. Blocks 110 to 130/140 a to 140 c correspond tothe blocks 110 to 130/140 of FIG. 17 , respectively.

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from other wireless devices or BSs. Thecontrol unit 120 may perform various operations by controllingconstituent elements of the hand-held device 100. The control unit 120may include an Application Processor (AP). The memory unit 130 may storedata/parameters/programs/code/commands needed to drive the hand-helddevice 100. The memory unit 130 may store input/output data/information.The power supply unit 140 a may supply power to the hand-held device 100and include a wired/wireless charging circuit, a battery, etc. Theinterface unit 140 b may support connection of the hand-held device 100to other external devices. The interface unit 140 b may include variousports (e.g., an audio I/O port and a video I/O port) for connection withexternal devices. The I/O unit 140 c may input or output videoinformation/signals, audio information/signals, data, and/or informationinput by a user. The I/O unit 140 c may include a camera, a microphone,a user input unit, a display unit 140 d, a speaker, and/or a hapticmodule.

As an example, in the case of data communication, the I/O unit 140 c mayacquire information/signals (e.g., touch, text, voice, images, or video)input by a user and the acquired information/signals may be stored inthe memory unit 130. The communication unit 110 may convert theinformation/signals stored in the memory into radio signals and transmitthe converted radio signals to other wireless devices directly or to aBS. The communication unit 110 may receive radio signals from otherwireless devices or the BS and then restore the received radio signalsinto original information/signals. The restored information/signals maybe stored in the memory unit 130 and may be output as various types(e.g., text, voice, images, video, or haptic) through the I/O unit 140c.

FIG. 19 shows a vehicle or an autonomous vehicle, based on an embodimentof the present disclosure. The vehicle or autonomous vehicle may beimplemented by a mobile robot, a car, a train, a manned/unmanned AerialVehicle (AV), a ship, etc. The embodiment of FIG. 19 may be combinedwith various embodiments of the present disclosure.

Referring to FIG. 19 , a vehicle or autonomous vehicle 100 may includean antenna unit 108, a communication unit 110, a control unit 120, adriving unit 140 a, a power supply unit 140 b, a sensor unit 140 c, andan autonomous driving unit 140 d. The antenna unit 108 may be configuredas a part of the communication unit 110. The blocks 110/130/140 a to 140d correspond to the blocks 110/130/140 of FIG. 17 , respectively.

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from external devices such as othervehicles, BSs (e.g., gNBs and road side units), and servers. The controlunit 120 may perform various operations by controlling elements of thevehicle or the autonomous vehicle 100. The control unit 120 may includean Electronic Control Unit (ECU). The driving unit 140 a may cause thevehicle or the autonomous vehicle 100 to drive on a road. The drivingunit 140 a may include an engine, a motor, a powertrain, a wheel, abrake, a steering device, etc. The power supply unit 140 b may supplypower to the vehicle or the autonomous vehicle 100 and include awired/wireless charging circuit, a battery, etc. The sensor unit 140 cmay acquire a vehicle state, ambient environment information, userinformation, etc. The sensor unit 140 c may include an InertialMeasurement Unit (IMU) sensor, a collision sensor, a wheel sensor, aspeed sensor, a slope sensor, a weight sensor, a heading sensor, aposition module, a vehicle forward/backward sensor, a battery sensor, afuel sensor, a tire sensor, a steering sensor, a temperature sensor, ahumidity sensor, an ultrasonic sensor, an illumination sensor, a pedalposition sensor, etc. The autonomous driving unit 140 d may implementtechnology for maintaining a lane on which a vehicle is driving,technology for automatically adjusting speed, such as adaptive cruisecontrol, technology for autonomously driving along a determined path,technology for driving by automatically setting a path if a destinationis set, and the like.

For example, the communication unit 110 may receive map data, trafficinformation data, etc. from an external server. The autonomous drivingunit 140 d may generate an autonomous driving path and a driving planfrom the obtained data. The control unit 120 may control the drivingunit 140 a such that the vehicle or the autonomous vehicle 100 may movealong the autonomous driving path according to the driving plan (e.g.,speed/direction control). In the middle of autonomous driving, thecommunication unit 110 may aperiodically/periodically acquire recenttraffic information data from the external server and acquiresurrounding traffic information data from neighboring vehicles. In themiddle of autonomous driving, the sensor unit 140 c may obtain a vehiclestate and/or surrounding environment information. The autonomous drivingunit 140 d may update the autonomous driving path and the driving planbased on the newly obtained data/information. The communication unit 110may transfer information about a vehicle position, the autonomousdriving path, and/or the driving plan to the external server. Theexternal server may predict traffic information data using AItechnology, etc., based on the information collected from vehicles orautonomous vehicles and provide the predicted traffic information datato the vehicles or the autonomous vehicles.

Claims in the present description can be combined in a various way. Forinstance, technical features in method claims of the present descriptioncan be combined to be implemented or performed in an apparatus, andtechnical features in apparatus claims can be combined to be implementedor performed in a method. Further, technical features in method claim(s)and apparatus claim(s) can be combined to be implemented or performed inan apparatus. Further, technical features in method claim(s) andapparatus claim(s) can be combined to be implemented or performed in amethod.

What is claimed is:
 1. A method for performing wireless communication bya first device, the method comprising: obtaining a sidelink (SL)discontinuous reception (DRX) configuration including informationrelated to an SL DRX timer, wherein the SL DRX timer is at least one ofan SL DRX onduration timer or an SL DRX inactivity timer; obtaininginformation related to a scheduling request (SR) configuration for a SLchannel state information (CSI) reporting medium access control (MAC)control element (CE); transmitting, to the base station, an SR forrequesting a resource for a SL DRX command MAC CE, based on the SRconfiguration for the SL CSI reporting MAC CE, wherein the SRconfiguration for the SL CSI reporting MAC CE is considered as an SRconfiguration for the SL SRX command MAC CE; and transmitting, to thesecond device, the SL DRX command MAC CE, based on the resource, whereinthe SL DRX command MAC CE is information for stopping at least one ofthe SL DRX onduration timer or the SL DRX inactivity timer.
 2. Themethod of claim 1, further comprising: receiving, from the seconddevice, first sidelink control information (SCI) for scheduling of aphysical sidelink shared channel (PSSCH) and second SCI through aphysical sidelink control channel (PSCCH); and based on the resourcerelated to the PSSCH, receiving, from the second device, the second SCIand CSI reference signal (RS) including information related to an SL CSIrequest.
 3. The method of claim 2, further comprising: triggering SL CSIreporting, based on the second SCI.
 4. The method of claim 3, furthercomprising: based on the triggering the SL CSI reporting, generating theSL CSI reporting MAC CE.
 5. The method of claim 1, wherein reportingrelated to the SL DRX command MAC CE is mapped with the SR configurationfor the SL CSI reporting MAC CE.
 6. The method of claim 1, furthercomprising: triggering a procedure related to the SL DRX command MAC CE;wherein based on the triggering the procedure related to the SL DRXcommand MAC CE and the resource, the SL DRX command MAC CE istransmitted to the second device.
 7. The method of claim 1, furthercomprising: receiving information related to uplink (UL) resources fromthe base station; wherein the UL resource includes a physical uplinkcontrol channel (PUCCH) resource, the SR is transmitted to the basestation through PUCCH based on the PUCCH resource, and the PUCCHresource is configured for each UL bandwidth part (BWP) for a procedurerelated to the SL DRX command MAC CE.
 8. The method of claim 1, furthercomprising: based on the SR, receiving, from the base station,information related to the resource for the SL DRX command MAC CE. 9.The method of claim 1, wherein the SL DRX configuration includesinformation related to an active time of the second device, and at leastone of a time when the SL DRX on-duration timer is running or a timewhen the SL DRX inactivity timer is running is included in the activetime of the second device.
 10. The method of claim 1, wherein the SL DRXcommand MAC CE includes a hybrid automatic repeat request (HARQ)feedback enabled SL DRX command MAC CE.
 11. The method of claim 8,further comprising: receiving HARQ feedback information related to theSL DRX command MAC CE; and based on the HARQ feedback information beingreceived, transmitting positive-ACK information to the base station. 12.The method of claim 1, further comprising: canceling an SL buffer statereport (BSR) procedure, based on the SL DRX command MAC CE beingtransmitted.
 13. The method of claim 1, wherein based on the priority ofthe SL DRX command MAC CE being higher than the priority of the SL CSIreporting MAC CE, the SR for requesting the resource for the SL DRXcommand MAC CE is transmitted to the base station; and SR for requestingresources for the SL CSI reporting MAC CE is not transmitted.
 14. Afirst device adapted to perform wireless communication, the first devicecomprising: one or more memories storing instructions; one or moretransceivers; and one or more processors connected to the one or morememories and the one or more transceivers, wherein the one or moreprocessors execute the instructions to: obtain a sidelink (SL)discontinuous reception (DRX) configuration including informationrelated to an SL DRX timer, wherein the SL DRX timer is at least one ofan SL DRX onduration timer or an SL DRX inactivity timer; obtaininformation related to a scheduling request (SR) configuration for a SLchannel state information (CSI) reporting medium access control (MAC)control element (CE); transmit, to the base station, an SR forrequesting a resource for a SL DRX command MAC CE, based on the SRconfiguration for the SL CSI reporting MAC CE, wherein the SRconfiguration for the SL CSI reporting MAC CE is considered as an SRconfiguration for the SL DRX command MAC CE; and transmit, to the seconddevice, the SL DRX command MAC CE, based on the resource, wherein the SLDRX command MAC CE is information for stopping at least one of the SLDRX onduration timer or the SL DRX inactivity timer.
 15. An apparatusadapted to control a first user equipment (UE), the apparatuscomprising: one or more processors; and one or more memories operablyconnected to the one or more processors and storing instructions,wherein the one or more processors execute the instructions to: obtain asidelink (SL) discontinuous reception (DRX) configuration includinginformation related to an SL DRX timer, wherein the SL DRX timer is atleast one of an SL DRX onduration timer or an SL DRX inactivity timer;obtain information related to a scheduling request (SR) configurationfor a SL channel state information (CSI) reporting medium access control(MAC) control element (CE); transmit, to the base station, an SR forrequesting a resource for a SL DRX command MAC CE, based on the SRconfiguration for the SL CSI reporting MAC CE, wherein the SRconfiguration for the SL CSI reporting MAC CE is considered as an SRconfiguration for the SL DRX command MAC CE; and transmit, to the secondUE, the SL DRX command MAC CE, based on the resource, wherein the SL DRXcommand MAC CE is information for stopping at least one of the SL DRXonduration timer or the SL DRX inactivity timer.
 16. The apparatus ofclaim 15, wherein the one or more processors execute the instructionsto: receive, from the second UE, first sidelink control information(SCI) for scheduling of a physical sidelink shared channel (PSSCH) andsecond SCI through a physical sidelink control channel (PSCCH); andbased on the resource related to the PSSCH, receive, from the second UE,the second SCI and CSI reference signal (RS) including informationrelated to an SL CSI request.
 17. The apparatus of claim 16, wherein theone or more processors execute the instructions to: trigger SL CSIreporting, based on the second SCI.
 18. The apparatus of claim 17,wherein the one or more processors execute the instructions to: based onthe triggering the SL CSI reporting, generate the SL CSI reporting MACCE.
 19. The apparatus of claim 15, wherein reporting related to the SLDRX command MAC CE is mapped with the SR configuration for the SL CSIreporting MAC CE.
 20. The apparatus of claim 15, wherein the one or moreprocessors execute the instructions to: trigger a procedure related tothe SL DRX command MAC CE, and wherein based on the triggering theprocedure related to the SL DRX command MAC CE and the resource, the SLDRX command MAC CE is transmitted to the second UE.